: A failure to correctly validate X.509 certificates in experimental HTTP/2 modules can allow unauthenticated users to bypass security controls. Summary of Service Risks Apache HTTP Server 2.4 vulnerabilities
Apache 2.4.18 served its purpose in 2015, but it is a liability in the modern threat landscape. With vulnerabilities ranging from CRLF injection to HTTP request smuggling, it represents a clear and present danger to any network infrastructure.
While the initial "Zero-Day" hype in 2021 (CVE-2021-41773) regarding path traversal largely targeted misconfigured servers (requiring Require all granted on the root directory), the vulnerability highlighted a weakness in how Apache normalizes paths. apache 2.4.18 vulnerabilities
– mod_http2 improper error handling (affects 2.4.18–2.4.23)
: A vulnerability in the core server can lead to local source code disclosure (e.g., serving PHP scripts as plain text) due to improper handling of certain legacy configuration settings. High & Moderate Risk Vulnerabilities : A failure to correctly validate X
– HTTP_PROXY environment variable name clash (aka “httpoxy”)
In cybersecurity, age is rarely a virtue. Apache 2.4.18 has served its time; it is time to retire it to history. While the initial "Zero-Day" hype in 2021 (CVE-2021-41773)
Apache HTTP Server version 2.4.18 is an outdated release with multiple known security vulnerabilities. It is highly recommended to upgrade to a supported version like Apache 2.4.66 to mitigate these risks.