CVE-2025-9090 Tenda AC20 Telnet Service telnet websFormDefine command injection
Remote attackers can execute arbitrary commands on Tenda AC20 routers via the Telnet service websFormDefine function.
- 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-2025-9090?
CVE-2025-9090 is a medium-severity command injection vulnerability in Tenda AC20, published on 17 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 16.03.08.12. Affected is the function websFormDefine of the file /goform/telnet of the component Telnet Service. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-9090?
It affects 1 product.
Products include Tenda Ac20 Firmware.
How do I fix CVE-2025-9090?
No fix has been published for CVE-2025-9090 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-9090 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9090 exists.
Public exploit code: 1 Exploit-DB entry and 1 proofs of concept on GitHub.
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-x5w2-r7p8-rfh5.