Vulnerability · Published Mar 23, 2026 · Assigned by VulDB
CVE-2026-4565Tenda AC21 SetNetControlList formSetQosBand buffer overflow
High 8.8
In plain English
A high-severity buffer overflow in AC21 from Tenda. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)1.0%top 38.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A vulnerability was detected in Tenda AC21 16.03.08.16. Impacted is the function formSetQosBand of the file /goform/SetNetControlList. Performing a manipulation of the argument list results in buffer overflow. The attack can be initiated remotely. The exploit is now public and may be used.
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-352402 | Tenda AC21 SetNetControlList formSetQosBand buffer overflow vdb-entry, technical-description
- VDB-352402 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #775119 | Tenda AC21 Tenda AC21 V1.0 V16.03.08.16 Buffer Overflow third-party-advisory
- https://github.com/hellonestor/killallbug/issues/14 issue-tracking
- https://github.com/hellonestor/killallbug/releases/tag/poc exploit, patch
- https://www.tenda.com.cn/ product