{"id":"CVE-2011-4415","details":"The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the \"len +=\" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.","modified":"2026-01-27T04:11:58.254660Z","published":"2011-11-08T11:55:05Z","withdrawn":"2026-01-27T04:11:58.254660Z","references":[{"type":"FIX","url":"http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/"},{"type":"EVIDENCE","url":"http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html"},{"type":"WEB","url":"http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041"},{"type":"WEB","url":"http://www.gossamer-threads.com/lists/apache/dev/403775"}],"schema_version":"1.7.3"}