OS Command Injection in Totolink A8000RU Router
CVE-2026-7139

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
27 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7139?

A significant vulnerability has been identified in the Totolink A8000RU router, specifically within the setWiFiAclRules function located in the /cgi-bin/cstecgi.cgi file of the CGI Handler component. This flaw allows remote attackers to manipulate the mode argument, potentially leading to unauthorized command execution on the device. The exploit has been publicly documented, posing serious risks to users. Immediate attention to patching and securing affected devices is strongly advised to mitigate any potential exploitation.

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-2026-7139 - Proof of Concept

References

https://vuldb.com/vuln/359738
vdb-entrytechnical-description
https://vuldb.com/vuln/359738/cti
signaturepermissions-required
https://vuldb.com/submit/801106
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)
.