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Vulnerability record · CVE-2025-4076 · published 29 April 2025

CVE-2025-4076: Injection vulnerability

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.

5.3 CVSS 4.0 Medium EPSS 18% · top 2.9% CWE-74 · InjectionCWE-77 · Command injection Deferred
5.3CVSS 4.0 base score, v2 6.5
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/GrayLxton/BLink_poc
https://github.com/GrayLxton/BLink_poc/blob/main/poc.py
https://vuldb.com/?ctiid.306513
https://vuldb.com/?id.306513
https://vuldb.com/?submit.560232

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Source: NIST National Vulnerability Database (record CVE-2025-4076), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.