Remote OS Command Injection in Totolink A8000RU Web Management Interface
CVE-2026-9457

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
25 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9457?

A vulnerability exists in the Totolink A8000RU router that allows for remote OS command injection through the UploadFirmwareFile function within the Web Management Interface. Specifically, by manipulating the FileName parameter in the /cgi-bin/cstecgi.cgi file, an attacker can execute arbitrary operating system commands. This presents a significant risk, as the exploit is publicly known and can be leveraged by malicious actors to compromise device security.

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-2026-9457 - Proof of Concept

References

https://vuldb.com/vuln/365438
vdb-entrytechnical-description
https://vuldb.com/vuln/365438/cti
signaturepermissions-required
https://vuldb.com/submit/813454
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

LtzHust (VulDB User)
.