CVE-2026-19821 Tenda AC12 httpd web management interface SetSysAutoRebbotCfg formSetRebootTimer buffer overflow
Remote attackers can trigger a buffer overflow in the Tenda AC12 router's web interface, 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-2026-19821?
CVE-2026-19821 is a high-severity memory corruption vulnerability in Tenda AC12, published on 14 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in Tenda AC12 15.03.06.23_multi_TD01. This vulnerability affects the function formSetRebootTimer of the file /goform/SetSysAutoRebbotCfg of the component httpd web management interface. This manipulation of the argument rebootTime causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2026-19821?
How do I fix CVE-2026-19821?
No fix has been published for CVE-2026-19821 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-2026-19821 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19821 exists.
Sources
Also known as GHSA-ch7j-xq25-cfm2.