Auth bypass in Lb-Link Bl-Ac1900
CVE-2025-7574
A vulnerability, which was classified as critical, was found in LB-LINK BL-AC1900, BL-AC2100_AZ3, BL-AC3600, BL-AX1800, BL-AX5400P and BL-WR9000 up to 20250702. Affected is the function reboot/restore of the file /cgi-bin/lighttpd.cgi of the component Web Interface. The manipulation leads to improper authentication. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.001
Affected products
- Lb-Link Bl-Ac1900 — versions 20250702
- Lb-Link Bl-Ac2100 Az3 — versions 20250702
- Lb-Link Bl-Ac3600 — versions 20250702
- Lb-Link Bl-Ax1800 — versions 20250702
- Lb-Link Bl-Ax5400p — versions 20250702
- Lb-Link Bl-Wr9000 — versions 20250702
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/waiwai24/0101/blob/main/CVEs/Blink/Privilege_Control_Defect_in_Blink… (related)
- github.com/waiwai24/0101/blob/main/CVEs/Blink/Privilege_Control_Defect_in_Blink… (exploit)
Frequently asked questions
- What is CVE-2025-7574?
- CVE-2025-7574 is a critical-severity vulnerability in Lb-Link Bl-Ac1900, classified under Improper Authentication. CVSS score: 9.8/10. Published 2025-07-14.
- How severe is CVE-2025-7574?
- Critical severity. CVSS v3 base score is 9.8 out of 10.