CVE-2025-9090: Tenda AC20 Telnet Service telnet websFormDefine command injection

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 16.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-08-17 · updated 2026-06-17
Weakness: CWE-74

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.

Affected products

Tenda AC20: 16.03.08.12

References

https://github.com/ZZ2266/.github.io/blob/main/AC20/telnet/readme.md
https://github.com/ZZ2266/.github.io/blob/main/AC20/telnet/readme.md#poc-exploit-steps
https://vuldb.com/?ctiid.320358
https://vuldb.com/?id.320358
https://vuldb.com/?submit.632232
https://www.tenda.com.cn/

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