CVE-2025-5862 in AC7
Summary
by MITRE • 06/09/2025
A vulnerability was found in Tenda AC7 15.03.06.44 and classified as critical. This issue affects the function formSetPPTPUserList of the file /goform/setPptpUserList. The manipulation of the argument list leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 06/09/2025
The vulnerability identified as CVE-2025-5862 represents a critical buffer overflow flaw in the Tenda AC7 router firmware version 15.03.06.44. This issue resides within the formSetPPTPUserList function of the /goform/setPptpUserList file, which is part of the web-based administrative interface. The router's web server processes user input through this endpoint without adequate bounds checking, creating a pathway for malicious actors to exploit the vulnerability. The buffer overflow occurs when the application fails to properly validate the length of input arguments passed to the function, allowing an attacker to exceed the allocated memory buffer and potentially overwrite adjacent memory locations. This type of vulnerability falls under CWE-121, which describes buffer overflow conditions where insufficient boundary checking allows for memory corruption. The exploitation of this flaw can be initiated remotely through the web interface, eliminating the need for physical access to the device.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as buffer overflows of this nature can enable arbitrary code execution on the affected device. When an attacker successfully exploits the buffer overflow in the PPTP user list management functionality, they gain the ability to execute malicious code with the privileges of the web server process, which typically runs with elevated permissions on the router. This could lead to complete compromise of the device, allowing attackers to establish persistent backdoors, modify network configurations, intercept traffic, or use the router as a pivot point for attacking other devices on the local network. The public disclosure of the exploit means that this vulnerability is actively being used in the wild, increasing the risk to organizations and individuals who have not yet patched their affected devices. The attack vector through the web interface aligns with ATT&CK technique T1071.004, which covers application layer protocols including web protocols, making this vulnerability particularly dangerous in environments where routers are exposed to external networks.
Mitigation strategies for CVE-2025-5862 should prioritize immediate firmware updates from Tenda, as the vendor likely released patches addressing the buffer overflow condition. Network segmentation and access control measures should be implemented to limit exposure of the affected routers to untrusted networks, particularly by blocking external access to the web management interface. Organizations should consider implementing network monitoring to detect potential exploitation attempts through unusual traffic patterns or unauthorized configuration changes. The implementation of web application firewalls or intrusion prevention systems can help detect and block malicious requests targeting the vulnerable endpoint. Additionally, network administrators should conduct thorough inventory checks to identify all affected Tenda AC7 devices and ensure proper patch management procedures are in place. The vulnerability demonstrates the critical importance of input validation and memory safety practices in embedded systems, as highlighted by CWE-122, which addresses buffer overflow conditions in heap-based data structures. Regular security assessments of network infrastructure, including firmware version checks and vulnerability scanning, should be conducted to identify and remediate similar issues before they can be exploited by threat actors.