OS Command Injection Vulnerability in Totolink A7100RU Router
CVE-2026-5996

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
10 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5996?

A security vulnerability has been identified in the Totolink A7100RU router, specifically in the CGI Handler component. The issue resides in the 'setAdvancedInfoShow' function of the file /cgi-bin/cstecgi.cgi. An attacker has the ability to manipulate the 'tty_server' argument, which can lead to OS command injection. This flaw is particularly concerning as it allows remote attackers to execute arbitrary commands on the affected device. The details of the exploit have been made public, emphasizing the urgent need for users to secure their devices against potential attacks.

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-2026-5996 - Proof of Concept

References

https://vuldb.com/vuln/356550
vdb-entrytechnical-description
https://vuldb.com/vuln/356550/cti
signaturepermissions-required
https://vuldb.com/submit/792044
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)
.