OS Command Injection in Totolink Router A7100RU
CVE-2026-5691

6.9MEDIUM

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5691?

A security flaw has been identified in the Totolink A7100RU router, specifically within the setFirewallType function of the cstecgi.cgi file. This vulnerability allows attackers to manipulate the firewallType parameter, potentially leading to OS command injection. This threat can be exploited remotely, posing significant risks to network environments. With the details of this vulnerability disclosed publicly, immediate awareness and action are crucial to safeguard systems relying on the affected software version.

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-2026-5691 - Proof of Concept

References

https://vuldb.com/vuln/355518
vdb-entrytechnical-description
https://vuldb.com/vuln/355518/cti
signaturepermissions-required
https://vuldb.com/submit/792962
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

LtzHust2 (VulDB User)
.