OS Command Injection in Totolink A8000RU by Totolink
CVE-2026-7140

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
27 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7140?

A security vulnerability exists in the Totolink A8000RU, where manipulation of the argument HTTP within the CsteSystem function of the CGI Handler can lead to OS command injection. This vulnerability allows remote attackers to execute arbitrary commands on the device, posing a significant threat to the integrity and security of the affected system. Mitigation strategies are necessary to protect against potential exploits that may arise from this publicly disclosed vulnerability.

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-2026-7140 - Proof of Concept

References

https://vuldb.com/vuln/359739
vdb-entrytechnical-description
https://vuldb.com/vuln/359739/cti
signaturepermissions-required
https://vuldb.com/submit/801110
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)
.