CVE-2025-13446 Tenda AC21 SetSysTimeCfg stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda AC21 router via the SetSysTimeCfg endpoint, 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-2025-13446?
CVE-2025-13446 is a high-severity memory corruption vulnerability in Tenda AC21, published on 20 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in Tenda AC21 16.03.08.16. This vulnerability affects unknown code of the file /goform/SetSysTimeCfg. The manipulation of the argument timeZone/time leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-13446?
It affects 1 product.
Products include Tenda Ac21 Firmware.
How do I fix CVE-2025-13446?
No fix has been published for CVE-2025-13446 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-2025-13446 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-13446 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-8xxq-7578-r2ww.