OS Command Injection Vulnerability in Totolink A3300R Router
CVE-2026-5679

5.1MEDIUM

Key Information:

Vendor

Totolink
Status
A3300r
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5679?

A security vulnerability has been identified in the Totolink A3300R router, specifically within the function vsetTr069Cfg located in the /cgi-bin/cstecgi.cgi file. This issue arises from improper handling of the stun_pass argument, allowing an attacker to execute arbitrary commands on the operating system. The details of this exploit have been made public, increasing the urgency for users to apply necessary security measures.

Affected Version(s)

A3300R 17.0.0cu.557_B20221024

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-2026-5679 - Proof of Concept

References

https://vuldb.com/vuln/355506
vdb-entrytechnical-description
https://vuldb.com/vuln/355506/cti
signaturepermissions-required
https://vuldb.com/submit/792650
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Adjacent 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

m202572177 (VulDB User)
.