Command Injection Vulnerability in Tenda AC20 Telnet Service
CVE-2025-9090

5.3MEDIUM

Key Information:

Vendor

Tenda
Status
Ac20
Vendor
CVE Published:
17 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9090?

A command injection vulnerability has been discovered in the Tenda AC20 router's Telnet Service, specifically within the websFormDefine function of the /goform/telnet file. This flaw allows an attacker to execute arbitrary commands remotely, leading to unauthorized system access and potential compromise. The vulnerability has been publicly disclosed, increasing the urgency for users to ensure their devices are secured against potential exploitation.

Affected Version(s)

AC20 16.03.08.12

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-9090 - Proof of Concept

References

https://vuldb.com/?id.320358
vdb-entrytechnical-description
https://vuldb.com/?ctiid.320358
signaturepermissions-required
https://vuldb.com/?submit.632232
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

n0ps1ed (VulDB User)
.
CVE-2025-9090 : Command Injection Vulnerability in Tenda AC20 Telnet Service