CVE-2025-8131
Published: 25 July 2025
Summary
CVE-2025-8131 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Ac20 Firmware. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 41.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly requires validation and sanitization of argument list inputs to /goform/SetStaticRouteCfg to prevent stack-based buffer overflows from manipulated data.
Enforces memory protections such as stack canaries, ASLR, and DEP to mitigate exploitation of stack-based buffer overflows even if invalid inputs are processed.
Mandates timely flaw remediation through firmware patching to eliminate the specific buffer overflow vulnerability in Tenda AC20 v16.03.08.05.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote stack-based buffer overflow in the Tenda AC20 router's web management interface (/goform/SetStaticRouteCfg) enables arbitrary code execution, facilitating exploitation of public-facing applications (T1190) and remote services (T1210).
NVD Description
A vulnerability was found in Tenda AC20 16.03.08.05. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file /goform/SetStaticRouteCfg. The manipulation of the argument list leads to stack-based buffer overflow. The attack can…
more
be launched remotely. The exploit has been disclosed to the public and may be used.
Deeper analysisAI
CVE-2025-8131 is a critical stack-based buffer overflow vulnerability (CWE-119, CWE-121) affecting an unknown functionality in the /goform/SetStaticRouteCfg file of Tenda AC20 router firmware version 16.03.08.05. Published on 2025-07-25, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its potential for remote exploitation.
An attacker with low privileges can exploit this vulnerability remotely by manipulating the argument list sent to the affected endpoint, triggering the buffer overflow. Successful exploitation grants high impacts on confidentiality, integrity, and availability, enabling severe compromise of the targeted device.
Advisories reference a public exploit disclosure on GitHub at https://github.com/Thir0th/Thir0th-CVE/blob/main/Tenda_AC20_V16.03.08.05_has_a_stack_overflow.md, along with VulDB entries (https://vuldb.com/?ctiid.317527, https://vuldb.com/?id.317527, https://vuldb.com/?submit.619769) and the Tenda website (https://www.tenda.com.cn/). Practitioners should consult these for mitigation details, as the exploit has been disclosed to the public and may be used.
Details
- CWE(s)