Apache HTTP Server version 2.4.66 contains a double-free vulnerability in the 'mod_http2' module that can lead to a denial of service condition. This vulnerability allows an attacker to cause the server to crash by triggering improper memory management in the HTTP/2 module. The issue affects specifically version 2.4.66 and has been classified with medium severity. No official patch or remediation details are provided in the available data. There are no known exploits in the wild at this time.