Command Injection Vulnerability in Totolink A7100RU Router
CVE-2026-6138

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
13 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6138?

A command injection vulnerability has been detected in the Totolink A7100RU router, specifically within the function setAccessDeviceCfg located in the CGI Handler component, file /cgi-bin/cstecgi.cgi. This vulnerability allows an attacker to manipulate the MAC address argument, enabling unauthorized command execution via remote exploitation. Security measures should be implemented to mitigate potential risks associated with this exploit.

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-2026-6138 - Proof of Concept

References

https://vuldb.com/vuln/357002
vdb-entrytechnical-description
https://vuldb.com/vuln/357002/cti
signaturepermissions-required
https://vuldb.com/submit/792980
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)
.