Vadym Kolisnichenko

**Name of the Vulnerable Software and Affected Versions** TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553) **Description** This issue allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N routers. Authentication is not required to exploit this issue. The specific flaw exists within the parsing of file name extensions, resulting from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this issue to execute code in the context of root. **Recommendations** For TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553), as a temporary workaround, consider restricting access to the httpd service to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this issue.

**Name of the Vulnerable Software and Affected Versions** TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553) **Description** This issue allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N routers. Authentication is required to exploit this issue. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this issue to execute code in the context of root. **Recommendations** As a temporary workaround, consider disabling the httpd service until a patch is available. Restrict access to the TCP port 80 to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this issue.

**Name of the Vulnerable Software and Affected Versions** TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553) **Description** The issue results from the lack of proper access control within the httpd service, which listens on TCP port 80 by default. This allows network-adjacent attackers to disclose sensitive information on affected installations without requiring authentication. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise. **Recommendations** For TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553), as a temporary workaround, consider restricting access to the httpd service until a patch is available. Additionally, avoid using default or weak credentials for the router's administration interface to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553) **Description** This issue allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N routers. Authentication is required to exploit this issue. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this issue to execute code in the context of root. **Recommendations** For TP-Link TL-WR940N version 3.20.1 Build 200316 Rel.34392n (5553), as a temporary workaround, consider disabling the httpd service until a patch is available. Restrict access to the httpd service to minimize the risk of exploitation. Avoid using the vulnerable httpd service until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this issue.