CVE-2025-9091: tenda ac20_firmware Use of Hard-coded Password

Vulnerability summary

CVE-2025-9091 is a high (CVSS 7.8) Use of Hard-coded Password vulnerability in tenda ac20_firmware. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 17-08-2025
   PublishedVulnerability first disclosed.
2. 18-08-2025
   Last modifiedVulnerability information updated.

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.

• CWE-259Use of Hard-coded PasswordThe product contains a hard-coded password, which it uses for its own inbound authentication or for outbound communication to external components.
• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.