RCE in Lb-link Bl-ac3600
CVE-2025-4076
A vulnerability classified as critical has been found in LB-LINK BL-AC3600 up to 1.0.22. This affects the function easy_uci_set_option_string_0 of the file /cgi-bin/lighttpd.cgi of the component Password Handler. The manipulation of the ar…
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.011 (78.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Lb-link Bl-ac3600 — versions 1.0.0, 1.0.1, 1.0.2
Weakness classification (CWE)
References
- VDB-306513 | LB-LINK BL-AC3600 Password lighttpd.cgi easy_uci_set_option_string_0 command injection (vdb-entry, technical-description)
- VDB-306513 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
- Submit #560232 | LBlink BL-AC3600 1.0.22 Command Injection (third-party-advisory)
- github.com/GrayLxton/BLink_poc (exploit)
- github.com/GrayLxton/BLink_poc/blob/main/poc.py (exploit)
Frequently asked questions
- What is CVE-2025-4076?
- CVE-2025-4076 is a medium-severity vulnerability in Lb-link Bl-ac3600, classified under Command Injection. CVSS score: 6.3/10. Published 2025-04-29.
- How severe is CVE-2025-4076?
- Medium severity. CVSS v3 base score is 6.3 out of 10.