Apache Httpd 2.4.18 Exploit [2021] Jun 2026

CVE-2016-5387, nicknamed "HTTPOXY," is a misnomer. It is not an Apache bug per se, but a design flaw in how CGI scripts handled the Proxy header. An attacker could send a request containing a Proxy: http://evil.com header, tricking server-side scripts (PHP, Python, Go) into routing outgoing HTTP requests through a malicious proxy.

Apache 2.4.18 does not limit the number of simultaneous stream workers for a single HTTP/2 connection. apache httpd 2.4.18 exploit

This is a vulnerability affecting Apache versions 2.4.17 through 2.4.38. It allows a low-privileged user (like www-data ) to gain root access on a Unix-based system. Vulnerability Mechanism CVE-2016-5387, nicknamed "HTTPOXY," is a misnomer

: Detailed technical walkthroughs and proof-of-concept code are available at Exploit-DB (EDB-ID: 46676) Exploit-DB Secondary Vulnerabilities Other risks associated with this version include: X.509 Authentication Bypass (CVE-2016-4979) : Affects the experimental HTTP/2 module ( Apache 2

💡 If you cannot upgrade immediately, switching the MPM from prefork to event or worker can act as a temporary workaround for CVE-2019-0211, though this may impact compatibility with certain PHP modules like mod_php .