Kayran has detected that the Version of Apache HTTP Server being used might be vulnerable to Denial of Service (DoS). Also known as CVE-2003-0189.
The authentication module for your Apache versions does not properly handle threads safely when using the crypt_r or crypt functions on Unix.
That will allow remote attackers to initiate a Denial of Service attack through failed Basic authentication with valid usernames and passwords when a threaded MPM is being used.
This will cause a decrease in performance and also for interruptions in the availability of resources.
To fix CVE-2003-0189, upgrade the version of Apache HTTP Server being used to 2.0.46 or higher.