OS Command Injection in Totolink A7100RU Product
CVE-2026-5689

6.9MEDIUM

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5689?

A vulnerability has been identified in the Totolink A7100RU firmware version 7.4cu.2313_b20191024, specifically within the setNtpCfg function of the cgi-bin/cstecgi.cgi file. This issue arises from improper handling of the 'tz' argument, allowing attackers to perform OS command injection. Such manipulation could lead to unauthorized remote access and exploitation of the system. As the exploit is now public, it emphasizes the critical need for affected users to review their security measures promptly.

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-2026-5689 - Proof of Concept

References

https://vuldb.com/vuln/355516
vdb-entrytechnical-description
https://vuldb.com/vuln/355516/cti
signaturepermissions-required
https://vuldb.com/submit/792946
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)
.