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of service (DoS), crashing the router or overwhelming remote servers. | | [CVE-2025-52906](https://nvd.nist.gov/vuln/detail/CVE-2025-52906) | Critical | CVSS-B 9.3 | An unauthenticated command injection vulnerability that allows attackers to remotely execute arbitrary commands on the device. | | [CVE-2025-52907](https://nvd.nist.gov/vuln/detail/CVE-2025-52907) | High | CVSS-B 7.3 | A security bypass that attackers can exploit to corrupt system files, cause a persistent denial-of-service, or achieve arbitrary file writes. Chaining attacks could lead to remote code execution (RCE). | TOTOLINK is a manufacturer of networking products, including routers and other Internet of Things (IoT) devices used by consumers worldwide. The widespread adoption of these products makes their security a critical area of focus. We worked with TOTOLINK to address this issue, and they have released an updated firmware version to resolve it. Users are advised to install the [latest firmware](https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/247/ids/36.html) to secure their devices. This article provides a detailed technical analysis of these vulnerabilities. We will analyze the root cause and demonstrate the impacts. Palo Alto Networks customers are better protected from the threats described through the following products and services: * The [Next-Generation Firewall](https://docs.paloaltonetworks.com/ngfw) with a Threat Prevention or [Advanced Threat Prevention](https://docs.paloaltonetworks.com/advanced-threat-prevention/administration) security subscription can help block attacks. * Palo Alto Networks [Device Security](https://docs.paloaltonetworks.com/iot) solution provides immediate visibility, risk assessment, and risk mitigation across the entire device landscape. * [Cortex Xpanse](https://www.paloaltonetworks.com/cortex/cortex-xpanse) and the [ASM add-on for XSIAM](https://www.paloaltonetworks.com/cortex/cortex-xsiam) allow for detection of internet exposed TOTOLINK router devices which may be inadvertently accessible. If you think you might have been compromised or have an urgent matter, contact the [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html). | **Related Unit 42 Topics** | [**IoT Vulnerability**](https://unit42.paloaltonetworks.com/tag/iot-vulnerability/) | |----------------------------|-------------------------------------------------------------------------------------| ## Vulnerability Analysis The TOTOLINK X6000R router's web interface relies heavily on the /cgi-bin/cstecgi.cgi endpoint for its core functionality. This endpoint acts as a central processing hub, receiving user requests and determining the appropriate action to take. When the web interface sends a request to cstecgi.cgi, it includes a topicurl parameter. The HTTP server within the router uses the value of topicurl to determine which internal function to call, effectively making it a routing mechanism for controlling the router's configuration and operations. We discovered multiple vulnerabilities within the functions handled by this /cgi-bin/cstecgi.cgi endpoint, potentially allowing unauthenticated attackers to exploit the router's web interface. We will now proceed with a technical deep-dive into each vulnerability, starting with an argument injection vulnerability. ### CVE-2025-52905: Argument Injection Firmware version V9.4.0cu.1360\_B20241207 includes an input sanitization function designed to prevent command injection, shown in Figure 1. ![Screenshot of computer code in an IDE, featuring functions for string searching within given parameters.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/word-image-260112-159831-1.png) Figure 1. Input validation function for user input. This function's blocklist fails to filter the hyphen character (-), creating a High argument injection vulnerability across multiple components. ### CVE-2025-52906: Unauthenticated Command Injection The setEasyMeshAgentCfg function, responsible for configuring EasyMesh agent settings, is vulnerable to unauthenticated command injection. This vulnerability arises because the function fails to properly validate and sanitize the user-supplied input for the agentName parameter. As a result, an attacker can inject arbitrary commands that the router will execute with the privileges of the web server process. This vulnerability does not require authentication, meaning any attacker who can reach the router's web interface can exploit it. This type of vulnerability represents a failure of input validation. Gaining root access allows an attacker to: * Intercept traffic * Pivot to other devices on the network * Install persistent malware ### CVE-2025-52907: Security Bypass As established in the previous section, the firmware's sanitization function is implemented across multiple components but relies on an incomplete character blocklist. This allows an unauthenticated attacker to bypass the check and achieve arbitrary file manipulation. This same vulnerability extends to other components, including the setWizardCfg function (Figure 2). ![Screenshot of computer code featuring function calls and comments relating to user input, DHCP configuration, and a sanity check. Red boxes highlight theses three functions.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/word-image-262762-159831-2.png) Figure 2. Vulnerable setWizardCfg processing analysis. This vulnerability allows for an arbitrary file write by bypassing the same user-input confidence check, enabling an unauthenticated attacker to escalate their attack. This includes creating or modifying critical system files such as /etc/passwd to add new users, or altering boot scripts to achieve persistent RCE. ## Conclusion and Recommendations Home routers are the digital front door to the internet for millions of users. They serve as a key defense for personal data, smart home devices and corporate assets accessed via remote work. Unauthenticated attackers could exploit these vulnerabilities to disrupt network services, gain unauthorized access to devices and potentially execute arbitrary code. Timely firmware updates are crucial for mitigating these risks. These vulnerabilities underscore the importance of robust security practices in IoT devices and the shared responsibility of vendors, security researchers and users in maintaining a secure digital ecosystem. To protect against these threats, users should immediately upgrade their TOTOLINK X6000R router to the [latest available firmware](https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/247/ids/36.html) (V9.4.0cu.1498\_B20250826). For customers of Palo Alto Networks, our products deliver proactive protection against these vulnerabilities through the following services: * [Next-Generation Firewall](https://docs.paloaltonetworks.com/ngfw) with a Threat Prevention or [Advanced Threat Prevention](https://docs.paloaltonetworks.com/advanced-threat-prevention/administration) security subscription can help block attacks with best practices via Threat Prevention signature [95097](https://threatvault.paloaltonetworks.com/?query=95097) and [96495](https://threatvault.paloaltonetworks.com/?query=96495). * The Palo Alto Networks [Device Security](https://docs.paloaltonetworks.com/iot) security platform can leverage network traffic information to identify the vendor, model and firmware version of a device and identify specific devices that are affected by known vulnerabilities, and enforce risk-adaptive policies on these devices. * [Cortex Xpanse](https://www.paloaltonetworks.com/cortex/cortex-xpanse) and the [ASM add-on for XSIAM](https://www.paloaltonetworks.com/cortex/cortex-xsiam) allow for detection of internet exposed TOTOLINK router devices which may be inadvertently accessible. ## Disclosure Timeline * June 13, 2025: The vulnerabilities were reported to TOTOLINK by Palo Alto Networks. * June 19, 2025: TOTOLINK provided a fixed firmware build (V9.4.0cu.1454\_B20250619) for Palo Alto Networks to verify. * June 20, 2025: Palo Alto Networks initiated the process to assign CVEs to the vulnerabilities. * June 25, 2025: TOTOLINK made the updated firmware publicly available. * Sept. 23, 2025: The CVEs are published on the Palo Alto Networks GitHub. ## Additional Resources * [X6000R Latest Firmware](https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/247/ids/36.html) -- TOTOLINK * [New Vulnerability in QNAP QTS Firmware: CVE-2023-50358](https://unit42.paloaltonetworks.com/qnap-qts-firmware-cve-2023-50358/) -- Unit 42, Palo Alto Networks * [PANW-2025-0001](https://github.com/PaloAltoNetworks/u42-vulnerability-disclosures/blob/main/2025/PANW-2025-0001/PANW-2025-0001.md) -- Palo Alto Networks Vulnerability Disclosures GitHub * [PANW-2025-0002](https://github.com/PaloAltoNetworks/u42-vulnerability-disclosures/blob/main/2025/PANW-2025-0002/PANW-2025-0002.md) -- Palo Alto Networks Vulnerability Disclosures GitHub * [PANW-2025-0003](https://github.com/PaloAltoNetworks/u42-vulnerability-disclosures/blob/main/2025/PANW-2025-0003/PANW-2025-0003.md) -- Palo Alto Networks Vulnerability Disclosures GitHub Back to top ### Tags * [CVE-2025-52905](https://unit42.paloaltonetworks.com/tag/cve-2025-52905/ "CVE-2025-52905") * [CVE-2025-52906](https://unit42.paloaltonetworks.com/tag/cve-2025-52906/ "CVE-2025-52906") * [CVE-2025-52907](https://unit42.paloaltonetworks.com/tag/cve-2025-52907/ "CVE-2025-52907") * [IoT Vulnerability](https://unit42.paloaltonetworks.com/tag/iot-vulnerability/ "IoT 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: Phantom Taurus: A New Chinese Nexus APT and the Discovery of the NET-STAR Malware Suite](https://unit42.paloaltonetworks.com/phantom-taurus/ "Phantom Taurus: A New Chinese Nexus APT and the Discovery of the NET-STAR Malware Suite") ### 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 - 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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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