Lb Link · Lb-Link Bl-Ac3600 · CVE-2025-4076
**Name of the Vulnerable Software and Affected Versions**
LB-LINK BL-AC3600 versions up to 1.0.22
**Description**
A critical issue has been discovered, affecting the Password Handler component. Specifically, it impacts the `easy uci set option string 0` function within the `/cgi-bin/lighttpd.cgi` file. The manipulation of the `routepwd` argument leads to command injection, which can be initiated remotely. The issue has been publicly disclosed, and the vendor was notified but did not respond.
**Recommendations**
For LB-LINK BL-AC3600 versions up to 1.0.22, as a temporary workaround, consider disabling the `easy uci set option string 0` function until a patch is available. Restrict access to the `/cgi-bin/lighttpd.cgi` file to minimize the risk of exploitation. Avoid using the `routepwd` argument in the affected component until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.