OS Command Injection Vulnerability in Totolink A7100RU
CVE-2026-5688

6.9MEDIUM

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5688?

A security flaw exists in the Totolink A7100RU router, specifically within the setDdnsCfg function of the /cgi-bin/cstecgi.cgi file. This vulnerability allows an attacker to manipulate the 'provider' argument, potentially leading to OS command injection. Such attacks can be executed remotely, making the vulnerability a significant security concern. Exploits have been disclosed, emphasizing the need for immediate attention and remediation to protect 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-2026-5688 - Proof of Concept

References

https://vuldb.com/vuln/355515
vdb-entrytechnical-description
https://vuldb.com/vuln/355515/cti
signaturepermissions-required
https://vuldb.com/submit/792945
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)
.