OS Command Injection in Totolink A7100RU 7.4cu.2313
CVE-2026-6155

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
13 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6155?

A security weakness has been discovered in the Totolink A7100RU router with firmware version 7.4cu.2313. This vulnerability lies in the CGI Handler, specifically within the function setWanCfg, located in the /cgi-bin/cstecgi.cgi file. By manipulating the pppoeServiceName argument, an attacker can execute arbitrary operating system commands remotely. The availability of exploit code publicly increases the risk of unauthorized access and manipulation of the device, posing significant security concerns for users.

Affected Version(s)

A7100RU 7.4cu.2313

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-2026-6155 - Proof of Concept

References

https://vuldb.com/vuln/357035
vdb-entrytechnical-description
https://vuldb.com/vuln/357035/cti
signaturepermissions-required
https://vuldb.com/submit/793679
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

LtzHust2 (VulDB User)
.