CVE-2025-11091 Tenda AC21 SetStaticRouteCfg sscanf buffer overflow
A remote attacker can trigger a buffer overflow in the Tenda AC21 router's static route configuration, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-11091?
CVE-2025-11091 is a high-severity memory corruption vulnerability in Tenda AC21, published on 28 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2025-11091?
It affects 1 product.
Products include Tenda Ac21 Firmware.
How do I fix CVE-2025-11091?
No fix has been published for CVE-2025-11091 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-11091 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-11091 exists.
Other vulnerabilities in Tenda AC21
- CVE-2025-9605 Tenda AC21/AC23 GetParentControlInfo stack-based overflow
- CVE-2023-24333 Command injection in n/a
- CVE-2026-4565 Tenda AC21 SetNetControlList formSetQosBand buffer overflow
- CVE-2026-1637 Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
- CVE-2025-13445 Tenda AC21 SetIpMacBind stack-based overflow
Sources
Also known as GHSA-q44p-w6pc-7fm3.