Vulnerability · Published Sep 28, 2025 · Assigned by VulDB
CVE-2025-11091Tenda AC21 SetStaticRouteCfg sscanf buffer overflow
High 8.8
In plain English
A high-severity buffer overflow in AC21 from Tenda. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be exploited.
Affected products (as reported)
Weakness: CWE-120, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
References
- VDB-326173 | Tenda AC21 SetStaticRouteCfg sscanf buffer overflow vdb-entry, technical-description
- VDB-326173 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #661806 | Shenzhen Tenda Technology Co.,Ltd. AC21 <= V16.03.08.16 Buffer Overflow third-party-advisory
- https://github.com/maximdevere/CVE2/issues/2 exploit, issue-tracking
- https://www.tenda.com.cn/ product