What is CVE-2025-4076?

CVE-2025-4076 is a medium-severity vulnerability in Lb-Link Bl-Ac3600, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (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.

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 argument routepwd leads to command injection. It is possible to initiate 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.

EPSS: 0.173 (96.9th 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

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (exploit)
cna@vuldb.com (exploit)

Frequently asked questions

What is CVE-2025-4076?: CVE-2025-4076 is a medium-severity vulnerability in Lb-Link Bl-Ac3600, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (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.