Improper Authentication in LB-LINK Routers' Web Interface
CVE-2025-7574

9.3CRITICAL

Key Information:

Vendor

Lb-link

Status
Bl-ac1900
Bl-ac2100 Az3
Bl-ac3600
Bl-ax1800
Vendor
CVE Published:
14 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-7574?

A vulnerability has been identified in LB-LINK router models BL-AC1900, BL-AC2100_AZ3, BL-AC3600, BL-AX1800, BL-AX5400P, and BL-WR9000. This flaw occurs in the reboot/restore function of the Web Interface component, specifically in the /cgi-bin/lighttpd.cgi file. The issue allows unauthorized access due to improper authentication, potentially enabling remote attacks. Although the vendor was alerted about this disclosure, no response was received, raising concerns about the vulnerability's exploitation in the wild.

Affected Version(s)

BL-AC1900 20250702

BL-AC2100_AZ3 20250702

BL-AC3600 20250702

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-2025-7574 - Proof of Concept

References

https://vuldb.com/?id.316272
vdb-entrytechnical-description
https://vuldb.com/?ctiid.316272
signaturepermissions-required
https://vuldb.com/?submit.608018
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

waiwai24 (VulDB User)
.
CVE-2025-7574 : Improper Authentication in LB-LINK Routers' Web Interface