Apache Httpd 2.4.18 Exploit May 2026

Apache 2.4.18 was among the first versions to support the protocol via mod_http2 . However, early implementations lacked sufficient resource limits.

Systems using the mod_session_crypto module for managing user sessions are vulnerable to a cryptographic exploit. Apache HTTP Server 2.4 vulnerabilities apache httpd 2.4.18 exploit

A malicious script (e.g., PHP or CGI) running with low privileges can modify the scoreboard to point to a malicious function. When the Apache server undergoes a graceful restart —typically triggered daily by automated tasks like logrotate —the parent root process executes the malicious code, granting the attacker full root access to the server. Impact: Complete server takeover. 2. HTTP/2 Denial of Service (CVE-2016-1546) Apache 2