CVE-2025-4076 LB-LINK BL-AC3600 Password lighttpd.cgi easy_uci_set_option_string_0 command injection
Remote attackers can execute arbitrary commands on LB-LINK BL-AC3600 routers via the password handler, requiring authentication.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-4076?
CVE-2025-4076 is a medium-severity command injection vulnerability in LB-LINK BL-AC3600, published on 29 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-4076?
How do I fix CVE-2025-4076?
No fix has been published for CVE-2025-4076 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-4076 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4076 exists.
Sources
Also known as GHSA-c587-35qx-9wwg.