Command Injection Vulnerability in Totolink A8000RU Router
CVE-2026-7121

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
27 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7121?

A security flaw has been identified in the Totolink A8000RU router, specifically within the setWizardCfg function of the CGI Handler located in /cgi-bin/cstecgi.cgi. This vulnerability allows for os command injection via manipulation of input arguments. It can be exploited remotely, presenting a significant risk to the integrity of the affected system. The exploit has been disclosed and could potentially be utilized by malicious actors.

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-2026-7121 - Proof of Concept

References

https://vuldb.com/vuln/359720
vdb-entrytechnical-description
https://vuldb.com/vuln/359720/cti
signaturepermissions-required
https://vuldb.com/submit/800933
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)
.