Command Injection Vulnerability in Totolink A7100RU Router
CVE-2026-5677

6.9MEDIUM

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5677?

A security vulnerability has been identified in the Totolink A7100RU router, specifically within the CsteSystem function of the cgi-bin/cstecgi.cgi file. This flaw allows attackers to manipulate the resetFlags argument, thereby executing arbitrary OS commands remotely. The existence of this exploit, now publicly available, raises significant concerns as it can be leveraged for unauthorized access and control of affected systems.

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-2026-5677 - Proof of Concept

References

https://vuldb.com/vuln/355504
vdb-entrytechnical-description
https://vuldb.com/vuln/355504/cti
signaturepermissions-required
https://vuldb.com/submit/792606
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

LtzHuster2 (VulDB User)
.