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Shortly after this advisory was released, Microsoft issued an [out-of-band patch](https://www.catalog.update.microsoft.com/Search.aspx?q=KB4551762) to protect affected users from [CVE-2020-0796](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796). An out-of-band patch is typically released outside of the expected update period for a vendor. In this particular case, Microsoft is known to release updates on [Patch Tuesday](https://en.wikipedia.org/wiki/Patch_Tuesday), which was two days prior to this out-of-band update. This vulnerability exists within the Microsoft Server Message Block 3.0 (SMBv3), specifically regarding malformed compression headers. Compression headers are a feature that was added to SMBv3 negotiate context request packets in May 2019. For successful unauthenticated exploitation an attacker would need to craft a SMBv3 packet that contains the malformed compression header to a vulnerable SMBv3 Server. For SMBv3 clients would require enticing a user to connect to a compromised SMBv3 server that they control. At the time of release, Microsoft affirmed that they had not yet seen the vulnerability exploited in the wild (ITW). This vulnerability only affects SMBv3 and the following builds of the Microsoft Windows operating system (OS): * Windows 10 build 1903 and 1909 - 32-bit, x64 and ARM64 systems * Windows Server build 1903 and 1909 - 32-bit, x64 and ARM64 systems ### **Mitigation Actions** Review the workaround guidance provided by the [Microsoft Security Vulnerability](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796). As always, we recommend our customers patch their systems as soon as possible. Upgrade Cortex XDR and Traps agents for protection against this vulnerability regardless of whether your systems have installed the relevant security update from Microsoft. For client mitigation, recommend creating an outbound firewall rule to block SMB outbound on public and private interfaces. ## **Conclusion** Palo Alto Networks Cortex XDR and Traps provide protection against this vulnerability regardless of whether they are running on an unpatched instance of Microsoft Windows 10. Additionally, Palo Alto Networks offers multiple, additional complementary protections for this exploit. * **Cortex XDR and Traps can** : * Stop the vulnerability exploit on unpatched Windows 10 systems. To gain protection, customers should ensure they are running the latest agent versions, specifically XDR agent 7.0.1 or later and Traps agent 6.1.5 or later. * To mitigate this vulnerability the latest XDR and Traps agents will deploy the following methods of protection * Per the recommendation from Microsoft, the agent will disable SMBv3 compression through the OS registry. * Prevents exploit attempts by monitoring for malicious network packets that leverage this SMB exploit technique. The admin will be able to review the relevant Behavioral Threat Protection (BTP) alert which will be triggered by a BTP rule named "bioc.cve\_2020\_0796". * **WildFire** can stop the exploit with static signature detections. * **Next-Generation Firewalls** will automatically stop sessions when this vulnerability is detected via the Palo Alto Networks IPS security solution, relevant Threat IDs are: 57778 and 57775. As a member of the Microsoft Active Protections Program (MAPP) program, Palo Alto Networks received early details of the vulnerability, providing greater understanding of the threat, which helps us implement strong product coverage. As always, we recommend keeping your Microsoft products up to date with the latest patches to mitigate this vulnerability. Palo Alto Networks will update this Threat Brief with new information and recommendations as they become available. Back to top ### Tags * [CVE-2020-0796](https://unit42.paloaltonetworks.com/tag/cve-2020-0796/ "CVE-2020-0796") * [Remote Code Execution](https://unit42.paloaltonetworks.com/tag/remote-code-execution/ "Remote Code Execution") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: 2020 Unit 42 IoT Threat Report](https://unit42.paloaltonetworks.com/iot-threat-report-2020/ "2020 Unit 42 IoT Threat Report") ### Table of Contents * ### Related Articles * [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") * [VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/ "article - table of contents") * [Critical Vulnerabilities in Ivanti EPMM Exploited](https://unit42.paloaltonetworks.com/ivanti-cve-2026-1281-cve-2026-1340/ "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. 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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. 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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. 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