Vulnerability · Published Jan 29, 2026 · Assigned by VulDB
CVE-2026-1637Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
High 8.8
In plain English
A high-severity stack 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 0.7% (higher than 53% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 46.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
Affected products (as reported)
Weakness: CWE-121, 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-343416 | Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow vdb-entry, technical-description
- VDB-343416 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #740865 | Tenda AC21 V16.03.08.16 Buffer Overflow third-party-advisory
- https://github.com/LX-LX88/cve/issues/25 broken-link, exploit, issue-tracking
- https://www.tenda.com.cn/ product