CVE-2025-8940 Tenda AC20 saveParentControlInfo strcpy buffer overflow
Remote attackers can trigger a buffer overflow in the Tenda AC20 router via the saveParentControlInfo function, 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-2025-8940?
CVE-2025-8940 is a high-severity memory corruption vulnerability in Tenda AC20, published on 14 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was identified in Tenda AC20 up to 16.03.08.12. Affected by this vulnerability is the function strcpy of the file /goform/saveParentControlInfo. The manipulation of the argument Time leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-8940?
It affects 1 product.
Products include Tenda Ac20 Firmware.
How do I fix CVE-2025-8940?
No fix has been published for CVE-2025-8940 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-2025-8940 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8940 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-2025-14656 Tenda AC20 openSchedWifi httpd buffer overflow
- CVE-2025-13258 Tenda AC20 WifiExtraSet buffer overflow
Sources
Also known as GHSA-qjx8-48f6-78fq.