OS Command Injection in Totolink A7100RU Router Software
CVE-2026-5678

6.9MEDIUM

Key Information:

Vendor

Totolink
Status
A7100ru
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5678?

A security weakness has been discovered in the Totolink A7100RU router effective with the software version 7.4cu.2313_b20191024, specifically in the function setScheduleCfg located in /cgi-bin/cstecgi.cgi. This vulnerability allows attackers to manipulate the 'mode' argument, potentially enabling them to execute arbitrary OS commands. Because this vulnerability can be exploited remotely, it poses a significant risk, and proof-of-concept code has been publicly disclosed. Users are advised to secure their devices to prevent exploitation.

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-2026-5678 - Proof of Concept

References

https://vuldb.com/vuln/355505
vdb-entrytechnical-description
https://vuldb.com/vuln/355505/cti
signaturepermissions-required
https://vuldb.com/submit/792608
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)
.