CVE-2025-9090: tenda ac20_firmware Injection

Vulnerability summary

CVE-2025-9090 is a critical (CVSS 9.8) Injection vulnerability in tenda ac20_firmware. EPSS estimates a 16.65% chance of exploitation in the next 30 days, higher than 97% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

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

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.

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.