CVE-2011-4415

The CVE-2011-4415 issue affects the Apache HTTP Server (2.0.x up to 2.0.64 and 2.2.x up to 2.2.21) when mod_setenvif is enabled. The root cause is an integer overflow in ap_pregsub during environment variable handling (SetEnvIf), with a crafted .htaccess and HTTP header causing memory exhaustion ...