OS Command Injection in Totolink A7100RU CGI Handler
CVE-2026-5975

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5975?

A vulnerability exists in the Totolink A7100RU router, specifically within the CGI Handler's setDmzCfg function. An attacker can exploit this vulnerability by manipulating the wanIdx argument in requests directed at /cgi-bin/cstecgi.cgi, allowing for OS command injection. Due to the nature of the vulnerability, it can be exploited remotely, making it a significant risk for users. Publicly available exploits amplify the urgency for affected users to apply necessary security measures.

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-2026-5975 - Proof of Concept

References

https://vuldb.com/vuln/356529
vdb-entrytechnical-description
https://vuldb.com/vuln/356529/cti
signaturepermissions-required
https://vuldb.com/submit/791821
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)
.