CVE-2025-9091: Tenda AC20 shadow hard-coded credentials

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-08-17 · updated 2026-06-17
Weakness: CWE-259

Description

A security flaw has been discovered in Tenda AC20 16.03.08.12. Affected by this vulnerability is an unknown functionality of the file /etc_ro/shadow. The manipulation leads to hard-coded credentials. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. 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/hardcoded%20password/readme.md#description
https://github.com/ZZ2266/.github.io/tree/main/AC20/hardcoded%20password/readme.md
https://vuldb.com/?ctiid.320359
https://vuldb.com/?id.320359
https://vuldb.com/?submit.632268
https://www.tenda.com.cn/
https://github.com/ZZ2266/.github.io/blob/main/AC20/hardcoded%20password/readme.md
https://github.com/ZZ2266/.github.io/blob/main/AC20/hardcoded%20password/readme.md#description

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