CVE-2025-14656 Tenda AC20 openSchedWifi httpd buffer overflow
Remote attackers can trigger a buffer overflow in the Tenda AC20 router's httpd service via crafted scheduling arguments, 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-2025-14656?
CVE-2025-14656 is a high-severity memory corruption vulnerability in Tenda AC20, published on 14 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A weakness has been identified in Tenda AC20 16.03.08.12. This affects the function httpd of the file /goform/openSchedWifi. Executing a manipulation of the argument schedStartTime/schedEndTime can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
Which versions are affected by CVE-2025-14656?
It affects 1 product.
Products include Tenda Ac20 Firmware.
How do I fix CVE-2025-14656?
No fix has been published for CVE-2025-14656 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-2025-14656 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-14656 exists.
Other vulnerabilities in Tenda AC20
- CVE-2025-15356 Tenda AC20 PowerSaveSet sscanf buffer overflow
- CVE-2025-14654 Tenda AC20 httpd setPptpUserList formSetPPTPUserList stack-based overflow
- CVE-2025-14655 Tenda AC20 httpd SetSysAutoRebbotCfg formSetRebootTimer stack-based overflow
- CVE-2025-13258 Tenda AC20 WifiExtraSet buffer overflow
- CVE-2025-11385 Tenda AC20 fast_setting_wifi_set sscanf buffer overflow
Sources
Also known as GHSA-qv52-c9fr-fjw8.