Command Injection Vulnerability in LB-LINK BL-AC3600 Routers
CVE-2025-4076

5.3MEDIUM

Key Information:

Vendor
Lb-link
Status
Bl-ac3600
Vendor
CVE Published:
29 April 2025

Badges

👾 Exploit Exists🟡 Public PoC

Summary

A command injection vulnerability exists in the LB-LINK BL-AC3600 router, specifically within the Password Handler component at the easy_uci_set_option_string_0 function located in /cgi-bin/lighttpd.cgi. An attacker can manipulate the routepwd argument to execute arbitrary commands on the device. This issue can be exploited remotely, enabling unauthorized access and control over the affected device. Despite early notification to the vendor regarding this vulnerability disclosure, no response has been received, raising concerns for users who rely on this router for secure network management.

Affected Version(s)

BL-AC3600 1.0.0

BL-AC3600 1.0.1

BL-AC3600 1.0.2

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-2025-4076 - Proof of Concept

CVE-2025-4076 - Proof of Concept

References

https://vuldb.com/?id.306513
vdb-entrytechnical-description
https://vuldb.com/?ctiid.306513
signaturepermissions-required
https://vuldb.com/?submit.560232
third-party-advisory

CVSS V4

Score:
5.3
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

Gray (VulDB User)
.