Command Injection Vulnerability in Totolink A8000RU by Totolink
CVE-2026-7136

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
27 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7136?

A command injection vulnerability exists in the CGI Handler of the Totolink A8000RU router, specifically within the setDmzCfg function found in /cgi-bin/cstecgi.cgi. This security flaw allows an attacker to manipulate the wanIdx argument to execute arbitrary commands on the operating system. With the exploit being publicly accessible, it poses significant risk, especially since the attack can be executed remotely, facilitating unauthorized access and control over the affected device.

Affected Version(s)

A8000RU 7.1cu.643_b20200521

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-2026-7136 - Proof of Concept

References

https://vuldb.com/vuln/359735
vdb-entrytechnical-description
https://vuldb.com/vuln/359735/cti
signaturepermissions-required
https://vuldb.com/submit/801007
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

LtzHuster2 (VulDB User)
.