OS Command Injection Vulnerability in Totolink A8000RU Router
CVE-2026-7122

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
27 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7122?

A critical OS command injection vulnerability has been identified in the Totolink A8000RU router, specifically within the setUPnPCfg function of the CGI component located in the /cgi-bin/cstecgi.cgi file. This flaw allows attackers to craft malicious requests, potentially executing arbitrary commands on the device remotely. Publicly disclosed details of this exploit raise significant security concerns for users of this router model, highlighting the urgent need for vendors and users alike to address this vulnerability to safeguard their networks.

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-2026-7122 - Proof of Concept

References

https://vuldb.com/vuln/359721
vdb-entrytechnical-description
https://vuldb.com/vuln/359721/cti
signaturepermissions-required
https://vuldb.com/submit/800934
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)
.