CVE-2012-5640: thttpd has a local DoS vulnerability via specially-crafted .htpasswd files

Security readout for executives and security teams

thttpd can be made unavailable by specially crafted .htpasswd files. The provided sources describe this as a local denial-of-service issue, so the main business impact is web service availability. They do not support data theft, remote code execution, or confirmed active exploitation. Exposure is most likely on legacy systems running thttpd, especially where local users, deployment jobs, or content-management processes can create or alter .htpasswd files. Public-facing services are relevant because local file manipulation can still affect externally visible availability. Treat as a targeted availability risk for legacy thttpd deployments. Prioritize if thttpd protects customer-facing services, shared hosting environments, or systems where untrusted users can write web configuration files. Mitigation focus: Inventory any systems running thttpd and using .htpasswd authentication.; Check Debian, Red Hat, and upstream guidance for corrected packages or vendor-specific status.; Restrict who can create or modify .htpasswd files on affected hosts..

Prepared

Jun 6, 2026, 04:48 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.