Remote OS Command Injection in Totolink A8000RU Web Management Interface
CVE-2026-9404

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
24 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9404?

A security vulnerability exists in the Totolink A8000RU, specifically in the Web Management Interface's function setDdnsCfg located in /cgi-bin/cstecgi.cgi. This flaw allows a remote attacker to inject OS commands by manipulating the argument provider. As a result, attackers can exploit this vulnerability, which is publicly documented and readily available, leading to potential unauthorized access to the device's operating system.

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-2026-9404 - Proof of Concept

References

https://vuldb.com/vuln/365385
vdb-entrytechnical-description
https://vuldb.com/vuln/365385/cti
signaturepermissions-required
https://vuldb.com/submit/813439
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)
.