OS Command Injection Vulnerability in Totolink A7100RU Router's CGI Handler
CVE-2026-6139

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
13 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6139?

A security vulnerability has been identified in the Totolink A7100RU router, particularly affecting the UploadOpenVpnCert function located in the /cgi-bin/cstecgi.cgi. This flaw allows attackers to manipulate the FileName argument, which can lead to OS command injection, enabling unauthorized remote command execution. Given that the exploit is publicly disclosed, it poses a significant risk to users of the affected product. It is crucial for administrators to implement mitigations to protect against potential attacks.

Affected Version(s)

A7100RU 7.4cu.2313_b20191024

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-2026-6139 - Proof of Concept

References

https://vuldb.com/vuln/357003
vdb-entrytechnical-description
https://vuldb.com/vuln/357003/cti
signaturepermissions-required
https://vuldb.com/submit/792982
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

LtzHuster (VulDB User)
.