OS Command Injection in Totolink A8000RU by Totolink
CVE-2026-7538

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
1 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7538?

A security flaw exists in the Totolink A8000RU router, specifically in the CGI Handler component located in the file /cgi-bin/cstecgi.cgi. This vulnerability allows an attacker to manipulate the argument 'proto', potentially leading to OS command injection. Remote attackers can exploit this issue, making it necessary to implement security measures promptly. Publicly available exploits increase the urgency for users to secure affected systems to prevent unauthorized access and potential damage.

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-2026-7538 - Proof of Concept

References

https://vuldb.com/vuln/360354
vdb-entrytechnical-description
https://vuldb.com/vuln/360354/cti
signaturepermissions-required
https://vuldb.com/submit/804321
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)
.