OS Command Injection Vulnerability in Totolink A8000RU Web Management Interface
CVE-2026-9433

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
25 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9433?

A security weakness has been identified in the Totolink A8000RU router affecting its web management interface. The vulnerability resides in the setMacFilterRules function within the /cgi-bin/cstecgi.cgi file, where improper handling of user input can lead to OS command injection. This flaw allows remote attackers to execute arbitrary commands on the device, potentially compromising its security. Publicly available exploits increase the urgency for users to address this 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-2026-9433 - Proof of Concept

References

https://vuldb.com/vuln/365414
vdb-entrytechnical-description
https://vuldb.com/vuln/365414/cti
signaturepermissions-required
https://vuldb.com/submit/813906
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)
.