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Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [CVE-2025-59287](https://unit42.paloaltonetworks.com/tag/cve-2025-59287/) * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/) * [Microsoft Vulnerability](https://unit42.paloaltonetworks.com/tag/microsoft-vulnerability/) * [Remote Code Execution](https://unit42.paloaltonetworks.com/tag/remote-code-execution/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/microsoft-cve-2025-59287/?pdf=download&lg=en&_wpnonce=64814e76fb "Click here to download") * [![Print 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Please refer to [Microsoft's website](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287) for the latest information. On Oct. 14, 2025, a critical, unauthenticated remote code execution (RCE) vulnerability was identified in Microsoft's Windows Server Update Services (WSUS), a core enterprise component for patch management. Microsoft's initial patch during the October Patch Tuesday did not fully address the flaw, necessitating an emergency out-of-band security update released Oct. 23, 2025. Within hours of the emergency update, Unit 42 and other security researchers observed active exploitation in the wild. The combination of a remotely exploitable, unauthenticated RCE in a core infrastructure service, coupled with observed active exploitation in the wild, represents a severe and time-sensitive risk. Key details of the threat are summarized below: * **Vulnerability**: Critical Remote Code Execution (RCE) in Windows Server Update Services (WSUS), tracked as CVE-2025-59287 (CVSS 9.8). * **Impact**: Allows a remote, unauthenticated attacker to execute arbitrary code with system privileges on affected servers. * **Status**: Actively Exploited. Threat actors were observed exploiting the vulnerability within hours of Microsoft releasing an emergency patch on Oct. 23. * **Urgency**: The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added this vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog on Oct. 24, underscoring the immediate risk. For organizations unable to deploy the emergency patches immediately, Microsoft has [recommended](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287) temporary workarounds to mitigate the risk. Palo Alto Networks customers are better protected from activity related to CVE-2025-59287 through the following products and services: * [Cortex XDR](https://docs-cortex.paloaltonetworks.com/p/XDR) and [XSIAM](https://docs-cortex.paloaltonetworks.com/p/XSIAM) * [Next-Generation Firewall](https://docs.paloaltonetworks.com/ngfw) with [Advanced Threat Prevention](https://docs.paloaltonetworks.com/advanced-threat-prevention/administration) The [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html) can also be engaged to help with a compromise or to provide a proactive assessment to lower your risk. | **Related Unit 42 Topics** | [**CVE-2025-59287**](https://unit42.paloaltonetworks.com/tag/cve-2025-59287/), **[Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/)** | |----------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------| ## Details of CVE-2025-59287 WSUS is a foundational tool for IT administrators, enabling the centralized management and distribution of Microsoft product updates across corporate networks. Its role as a trusted source for software patches makes it a high-value target; a compromise of a WSUS server can provide a foothold for lateral movement and widespread network compromise. The vulnerability is rooted in an "[unsafe deserialization of untrusted data](https://nvd.nist.gov/vuln/detail/CVE-2025-59287)." Security researchers have identified multiple attack paths including sending a specially crafted request to the GetCookie() endpoint, which causes the server to improperly deserialize an AuthorizationCookie object using the insecure BinaryFormatter. Another path targets the ReportingWebService to trigger unsafe deserialization via SoapFormatter. In both cases, a remote, unauthenticated attacker can trick the system into executing malicious code with the highest level of system privileges. The scope of this vulnerability is specific to systems with the WSUS role enabled: * **Affected Software:** Microsoft Windows Server 2012, 2012 R2, 2016, 2019, 2022 (including 23H2 Edition) and 2025. * **Required Condition:** The vulnerability only affects servers where the WSUS Server Role is enabled. This feature is not enabled by default. ## Current Scope of the Attack Using CVE-2025-59287 Following the public disclosure of a proof-of-concept exploit, Unit 42 in addition to other security firms quickly detected active scanning and exploitation. Analysis of the attacks observed by Unit 42 reveals a consistent methodology focused on initial access and internal network reconnaissance. * **Initial Access:** Attackers target publicly exposed WSUS instances on their default TCP ports, **8530** (HTTP) and **8531** (HTTPS). * **Execution:** Malicious PowerShell commands are executed via specific parent processes. Observed forensic process chains include wsusservice.exe → cmd.exe → cmd.exe → powershell.exe and w3wp.exe → cmd.exe → cmd.exe → powershell.exe. * **Reconnaissance:** The initial payload executes commands to gather intelligence on the internal network environment, including whoami, net user /domain, and ipconfig /all. This initial command set is designed to rapidly map the internal domain structure and identify high-value user accounts, providing the attacker with an immediate blueprint for lateral movement. * **Data Exfiltration:** Collected information is exfiltrated to a remote, attacker-controlled Webhook.site endpoint using a PowerShell payload that attempts Invoke-WebRequest and falls back to curl.exe if needed. Cortex Xpanse identified approximately 5,500 WSUS instances exposed to the internet, providing a tangible metric for the global attack surface. This reconnaissance-focused TTP indicates that initial exploitation is a precursor to broader network compromise, making immediate remediation and threat hunting paramount. ## Interim Guidance Microsoft has [recommended](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287) temporary workarounds to mitigate the risk for organizations unable to deploy the emergency patches immediately. These measures should be considered interim solutions until patching can be completed. We recommend that affected organizations follow this guidance to address the issue, and check back on official Microsoft language regularly for updates. As of Oct. 27, the guidance consisted of the following mitigations: 1. **Disable the WSUS Server Role**: Disabling the WSUS role on the server removes the attack vector entirely. However, this will prevent the server from managing and distributing updates to client systems. 2. **Block High-Risk Ports** : Block all inbound traffic to TCP ports **8530** and **8531** on the host-level firewall. As recommended by Microsoft, this removes the attack vector but will prevent the server from managing and distributing updates. ## Unit 42 Managed Threat Hunting Queries The Unit 42 Managed Threat Hunting team continues to track any attempts to exploit this CVE across our Managed Services customers, using telemetry available within Cortex XDR. Cortex XDR customers who don't leverage Unit 42 Managed Services can also use the following XQL query to search for signs of exploitation. // Title: WSUS RCE - Potentail CVE-2025-59287 exploitation // Description: Query looks for potential CVE-2025-59287 exploitation via identifying children processes of the WSUS service and IIS. // MITRE ATT\&CK TTP ID: T1190 dataset = xdr\_data | fields \_time, agent\_hostname, action\_process\_username, action\_process\_image\_name, action\_process\_image\_path, action\_process\_image\_command\_line, action\_process\_image\_sha256, action\_process\_cwd, action\_process\_file\_info, action\_process\_file\_size, actor\_effective\_username, actor\_process\_image\_name, actor\_process\_image\_path, actor\_process\_command\_line, actor\_process\_image\_sha256, causality\_actor\_primary\_username, causality\_actor\_process\_image\_name, causality\_actor\_process\_image\_path, causality\_actor\_process\_command\_line, causality\_actor\_process\_image\_sha256, os\_actor\_primary\_username, os\_actor\_process\_image\_name, os\_actor\_process\_image\_path, os\_actor\_process\_command\_line, os\_actor\_process\_image\_sha256, agent\_id, agent\_os\_type, agent\_os\_sub\_type, event\_type, event\_sub\_type, event\_id | filter agent\_os\_type = ENUM.AGENT\_OS\_WINDOWS and event\_type = ENUM.PROCESS and event\_sub\_type = ENUM.PROCESS\_START | filter (lowercase(actor\_process\_image\_name) = "wsusservice.exe" or lowercase(causality\_actor\_process\_image\_name) = "wsusservice.exe") or (lowercase(causality\_actor\_process\_image\_name) = "w3wp.exe" and lowercase(causality\_actor\_process\_command\_line) contains "wsuspool") or (lowercase(actor\_process\_image\_name) = "w3wp.exe" and lowercase(actor\_process\_command\_line) contains "wsuspool") | filter not (lowercase(action\_process\_image\_name) = "svchost.exe" and action\_process\_image\_command\_line contains "BITS") and lowercase(action\_process\_image\_name) not in ("conhost.exe", "csc.exe", "cvtres.exe", "oneagentdumpproc.exe", "vbc.exe", "werfault.exe", "\*wsuscertserver.exe", "\*wsusservice.exe", "w3wp.exe") | filter not (lowercase(actor\_process\_image\_name) = "svchost.exe" and actor\_process\_command\_line contains "BITS") | sort asc \_time |----------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | // Title: WSUS RCE - Potentail CVE-2025-59287 exploitation // Description: Query looks for potential CVE-2025-59287 exploitation via identifying children processes of the WSUS service and IIS. // MITRE ATT\&CK TTP ID: T1190 dataset = xdr\_data | fields \_time, agent\_hostname, action\_process\_username, action\_process\_image\_name, action\_process\_image\_path, action\_process\_image\_command\_line, action\_process\_image\_sha256, action\_process\_cwd, action\_process\_file\_info, action\_process\_file\_size, actor\_effective\_username, actor\_process\_image\_name, actor\_process\_image\_path, actor\_process\_command\_line, actor\_process\_image\_sha256, causality\_actor\_primary\_username, causality\_actor\_process\_image\_name, causality\_actor\_process\_image\_path, causality\_actor\_process\_command\_line, causality\_actor\_process\_image\_sha256, os\_actor\_primary\_username, os\_actor\_process\_image\_name, os\_actor\_process\_image\_path, os\_actor\_process\_command\_line, os\_actor\_process\_image\_sha256, agent\_id, agent\_os\_type, agent\_os\_sub\_type, event\_type, event\_sub\_type, event\_id | filter agent\_os\_type = ENUM.AGENT\_OS\_WINDOWS and event\_type = ENUM.PROCESS and event\_sub\_type = ENUM.PROCESS\_START | filter (lowercase(actor\_process\_image\_name) = "wsusservice.exe" or lowercase(causality\_actor\_process\_image\_name) = "wsusservice.exe") or (lowercase(causality\_actor\_process\_image\_name) = "w3wp.exe" and lowercase(causality\_actor\_process\_command\_line) contains "wsuspool") or (lowercase(actor\_process\_image\_name) = "w3wp.exe" and lowercase(actor\_process\_command\_line) contains "wsuspool") | filter not (lowercase(action\_process\_image\_name) = "svchost.exe" and action\_process\_image\_command\_line contains "BITS") and lowercase(action\_process\_image\_name) not in ("conhost.exe", "csc.exe", "cvtres.exe", "oneagentdumpproc.exe", "vbc.exe", "werfault.exe", "\*wsuscertserver.exe", "\*wsusservice.exe", "w3wp.exe") | filter not (lowercase(actor\_process\_image\_name) = "svchost.exe" and actor\_process\_command\_line contains "BITS") | sort asc \_time | ## Conclusion Based on the amount of publicly available information, the ease of use and the effectiveness of this exploit, Palo Alto Networks highly recommends following Microsoft's guidance to protect your organization. This vulnerability and subsequent weaponization serves as an illustration of how configuration failures enable exploitation. While the WSUS vulnerability provides the technical vector, its potentially severe impact is a direct consequence of lapses in security hygiene. The exposure of an internal-facing service, such as WSUS, to the public internet constitutes a significant misconfiguration that elevates a localized server vulnerability into a potential enterprise-wide, supply-chain compromise. This underscores that rigorous asset management and disciplined network segmentation are critical security controls, essential for mitigating the escalation of isolated flaws into systemic organizational breaches. Palo Alto Networks has shared our findings with our fellow Cyber Threat Alliance (CTA) members. CTA members use this intelligence to rapidly deploy protections to their customers and to systematically disrupt malicious cyber actors. Learn more about the [Cyber Threat Alliance](https://www.cyberthreatalliance.org/). Palo Alto Networks customers are better protected by our products, as listed below. We will update this threat brief as more relevant information becomes available. ## Palo Alto Networks Product Protections for CVE-2025-59287 Palo Alto Networks customers can leverage a variety of product protections and updates to help identify and defend against this threat. If you think you might have been compromised or have an urgent matter, get in touch with the [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html) or call: * North America: Toll Free: +1 (866) 486-4842 (866.4.UNIT42) * UK: +44.20.3743.3660 * Europe and Middle East: +31.20.299.3130 * Asia: +65.6983.8730 * Japan: +81.50.1790.0200 * Australia: +61.2.4062.7950 * India: 000 800 050 45107 ### Advanced Threat Prevention [Next-Generation Firewall](https://docs.paloaltonetworks.com/ngfw) with the [Advanced Threat Prevention](https://docs.paloaltonetworks.com/advanced-threat-prevention/administration) security subscription can help block the attacks with best practices via the following Threat Prevention signature [96657](https://threatvault.paloaltonetworks.com/?q=96657) and [96684](https://threatvault.paloaltonetworks.com/?q=96684). ### Cortex XDR and XSIAM [Cortex XDR](https://docs-cortex.paloaltonetworks.com/p/XDR) and [XSIAM](https://docs-cortex.paloaltonetworks.com/p/XSIAM) help protect against post-exploitation activities using the multi-layer protection approach. [Cortex](https://docs-cortex.paloaltonetworks.com/p/XSOAR) has released a response pack and playbook for [CVE-2025-59287 - Microsoft WSUS Remote Code Execution](https://xsoar.pan.dev/docs/reference/playbooks/cve-2025-59287---microsoft-wsus-remote-code-execution) to help automate and speed the mitigation process. This playbook automates the following tasks: * Identifies and fingerprints WSUS hosts via XQL query * Collects indicators from the Unit 42 article * Detects any suspicious command lines indicative of exploitation of this vulnerability via an XQL query * Investigates the command lines to identify malicious indicators related to the vulnerability * Hunts for malicious indicators via an XQL query * Isolates compromised WSUS servers (requires analyst approval) * Blocks malicious indicators Provides mitigation recommendations ## Indicators of Compromise * hxxp://webhook\[.\]site/22b6b8c8-2e07-4878-a681-b772e569aa6a *Updated Oct. 27, 2025, at 1:50 p.m. PT to update Cortex product protection language.* *Updated Oct. 27, 2025, at 2:37 p.m. PT to add Managed Threat Hunting query.* *Updated Oct. 28, 2025, at 2:07 p.m. PT to revise Managed Threat Hunting query and add product protection language for Advanced Threat Prevention.* *Updated Oct. 30, 2025, at 9:45 a.m. PT to correct the Managed Threat Hunting query.* *Updated Nov. 3, 2025, at 4:50 p.m. PT to add an additional Threat Prevention signature. Added product protection information for Cortex XSOAR.* *Updated Nov. 4, 2025, at 7:00 a.m. PT to correct Cortex playbook information.* Back to top ### Tags * [CVE-2025-59287](https://unit42.paloaltonetworks.com/tag/cve-2025-59287/ "CVE-2025-59287") * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/ "Microsoft") * [Microsoft Vulnerability](https://unit42.paloaltonetworks.com/tag/microsoft-vulnerability/ "Microsoft Vulnerability") * [Remote Code Execution](https://unit42.paloaltonetworks.com/tag/remote-code-execution/ "Remote Code Execution") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: When AI Agents Go Rogue: Agent Session Smuggling Attack in A2A Systems](https://unit42.paloaltonetworks.com/agent-session-smuggling-in-agent2agent-systems/ "When AI Agents Go Rogue: Agent Session Smuggling Attack in A2A Systems") ### Table of Contents * ### Related Articles * [How We Added WebAuthn to a Browser-Based RDP Client](https://unit42.paloaltonetworks.com/webauthn-added-to-browser-based-rdp/ "article - table of contents") * [Inside AD CS Escalation: Unpacking Advanced Misuse Techniques and Tools](https://unit42.paloaltonetworks.com/active-directory-certificate-services-exploitation/ "article - table of contents") * [Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution](https://unit42.paloaltonetworks.com/captive-portal-zero-day/ "article - table of contents") ## Related Vulnerabilities Resources ![Pictorial representation of a group of people interacting with a dynamic 3D holographic display of colorful, undulating data waves on a table.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/11_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) August 4, 2026 [#### The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/) * [AI](https://unit42.paloaltonetworks.com/tag/ai/ "AI") * [Frontier AI](https://unit42.paloaltonetworks.com/tag/frontier-ai/ "Frontier AI") * [Vulnerability Exploitation](https://unit42.paloaltonetworks.com/tag/vulnerability-exploitation/ "Vulnerability Exploitation") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/ "The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software") ![Pictorial representation of AI-enabled autonomous cyberattacks. A digital illustration depicting abstract, interconnected data streams in vibrant colors on a dark blue background](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/07/AdobeStock_992950050-3-782x440.jpeg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) July 30, 2026 [#### Chinese-Speaking Threat Actor Harnesses AI Models for Autonomous Cyberattacks](https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/) * [ChatGPT](https://unit42.paloaltonetworks.com/tag/chatgpt/ "ChatGPT") * [Claude code](https://unit42.paloaltonetworks.com/tag/claude-code/ "Claude code") * [CVEs](https://unit42.paloaltonetworks.com/tag/cves/ "CVEs") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/ "Chinese-Speaking Threat Actor Harnesses AI Models for Autonomous Cyberattacks") ![Pictorial representation of three zero-day vulnerabilities in Siemens ROX II OT switches. Digital illustration of a global network featuring interconnected lines and nodes over a map of the world, highlighted with neon lights and digital elements.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/07/03_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) July 17, 2026 [#### Three Steps to the Terminal: A Siemens ROX II Zero-Day Trilogy](https://unit42.paloaltonetworks.com/siemens-rox-ii-zero-day-vulnerabilities/) * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2025-40947](https://unit42.paloaltonetworks.com/tag/cve-2025-40947/ "CVE-2025-40947") * [CVE-2025-40948](https://unit42.paloaltonetworks.com/tag/cve-2025-40948/ "CVE-2025-40948") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/siemens-rox-ii-zero-day-vulnerabilities/ "Three Steps to the Terminal: A Siemens ROX II Zero-Day Trilogy") ![Pictorial representation of PAN-OS CVE-2026-0257. A vibrant city skyline at night, with tall skyscrapers and glowing digital beams extending into the sky, suggesting advanced technology and connectivity.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/06/07_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) June 9, 2026 [#### Threat Brief: Active Exploitation of PAN-OS CVE-2026-0257](https://unit42.paloaltonetworks.com/active-exploitation-of-pan-os-cve-2026-0257/) * [CVE-2026-0257](https://unit42.paloaltonetworks.com/tag/cve-2026-0257/ "CVE-2026-0257") * [Vulnerability](https://unit42.paloaltonetworks.com/tag/vulnerability/ "vulnerability") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/active-exploitation-of-pan-os-cve-2026-0257/ "Threat Brief: Active Exploitation of PAN-OS CVE-2026-0257") ![Pictorial representation of CVE-2026-30300. Digital illustration of a map of North America with interconnected glowing lines and dots symbolizing network connections across the continent.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/06_Vulnerabilities_1920x900-3-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 6, 2026 [#### Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution](https://unit42.paloaltonetworks.com/captive-portal-zero-day/) * [CVE-2026-0300](https://unit42.paloaltonetworks.com/tag/cve-2026-0300/ "CVE-2026-0300") * [EarthWorm](https://unit42.paloaltonetworks.com/tag/earthworm/ "EarthWorm") * [PAN-OS](https://unit42.paloaltonetworks.com/tag/pan-os/ "PAN-OS") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/captive-portal-zero-day/ "Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution") ![Pictorial representation of a severe Linux vulnerability. Close-up of a woman wearing glasses and focusing intently on a computer screen.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/05_Vulnerabilities_1920x900-2-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 5, 2026 [#### Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years](https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/) * [Containers](https://unit42.paloaltonetworks.com/tag/containers/ "Containers") * [CVE-2026-31431](https://unit42.paloaltonetworks.com/tag/cve-2026-31431/ "CVE-2026-31431") * [Kubernetes](https://unit42.paloaltonetworks.com/tag/kubernetes/ "Kubernetes") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/ "Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years") ![Pictorial representation of CVE-2023-33538. Abstract image of a glowing red Wi-Fi symbol on a circuit board, with intricate patterns and a futuristic appearance.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/04/04_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) April 16, 2026 [#### A Deep Dive Into Attempted Exploitation of CVE-2023-33538](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/) * [Botnet](https://unit42.paloaltonetworks.com/tag/botnet/ "botnet") * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2023-33538](https://unit42.paloaltonetworks.com/tag/cve-2023-33538/ "CVE-2023-33538") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/ "A Deep Dive Into Attempted Exploitation of CVE-2023-33538") ![Pictorial representation of BeyondTrust vulnerability CVE-2026-1731. Digital art depicting a stylized mountain range with vibrant blue and red hues. The peaks are accentuated by glowing particles and an abstract, starry backdrop, creating a futuristic landscape.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/02/14_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) February 19, 2026 [#### VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/) * [Bash](https://unit42.paloaltonetworks.com/tag/bash/ "bash") * [CVE-2026-1731](https://unit42.paloaltonetworks.com/tag/cve-2026-1731/ "CVE-2026-1731") * [PowerShell](https://unit42.paloaltonetworks.com/tag/powershell/ "PowerShell") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/ "VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)") ![](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/02/AdobeStock_1020436911-786x440.jpeg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) February 17, 2026 [#### Critical Vulnerabilities in Ivanti EPMM Exploited](https://unit42.paloaltonetworks.com/ivanti-cve-2026-1281-cve-2026-1340/) * [CVE-2026-1281](https://unit42.paloaltonetworks.com/tag/cve-2026-1281/ "CVE-2026-1281") * [CVE-2026-1340](https://unit42.paloaltonetworks.com/tag/cve-2026-1340/ "CVE-2026-1340") * [Ivanti](https://unit42.paloaltonetworks.com/tag/ivanti/ "Ivanti") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ivanti-cve-2026-1281-cve-2026-1340/ "Critical Vulnerabilities in Ivanti EPMM Exploited") ![Pictorial representation of CVE-2025-0921. Digital illustration of a map of North America with interconnected glowing lines and dots symbolizing network connections across the continent.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/01/06_Vulnerabilities_1920x900-2-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) January 30, 2026 [#### Privileged File System Vulnerability Present in a SCADA System](https://unit42.paloaltonetworks.com/iconics-suite-cve-2025-0921/) * [CVE-2025-0921](https://unit42.paloaltonetworks.com/tag/cve-2025-0921/ "CVE-2025-0921") * [Privilege escalation](https://unit42.paloaltonetworks.com/tag/privilege-escalation/ "privilege escalation") * [SCADA](https://unit42.paloaltonetworks.com/tag/scada/ "SCADA") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/iconics-suite-cve-2025-0921/ "Privileged File System Vulnerability Present in a SCADA System") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/03/unit42-footer-subscribe-desktop.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Get updates from Unit 42 ## Peace of mind comes from staying ahead of threats. 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