OS Command Injection Vulnerability in Totolink A7100RU by Totolink
CVE-2026-6140

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
13 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6140?

An OS command injection vulnerability exists in the UploadFirmwareFile function located in the /cgi-bin/cstecgi.cgi file of the Totolink A7100RU. This flaw allows attackers to manipulate the FileName parameter, enabling remote execution of arbitrary commands on the affected device. Given that the exploit is already public, it poses a significant threat to users, especially if not patched promptly. For details on exploit techniques and mitigation strategies, consult resources from both VDB and third-party advisories.

Affected Version(s)

A7100RU 7.4cu.2313_b20191024

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-2026-6140 - Proof of Concept

References

https://vuldb.com/vuln/357004
vdb-entrytechnical-description
https://vuldb.com/vuln/357004/cti
signaturepermissions-required
https://vuldb.com/submit/792987
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)
.