http://httpd.apache.org/docs-2.0/new_features_2_0.html When upgrading or installing this version of Apache, please keep in mind the following:If you intend to use Apache with one of the threaded MPMs, you must ensure that the modules (and the libraries they depend on) that you will be using are thread-safe. Please contact the vendors of these modules to obtain this information. Apache 2.0.46 Major changes
Security vulnerabilities closed since Apache 2.0.45 *) SECURITY [CAN-2003-0245]: Fixed a bug that could be triggered remotely through mod_dav and possibly other mechanisms, causing an Apache child process to crash. The crash was first reported by David Endler and was researched and fixed by Joe Orton . Details will be released on 30 May 2003.*) SECURITY [CAN-2003-0189]: Fixed a denial-of-service vulnerability affecting basic authentication on Unix platforms related to thread-safety in apr_password_validate(). The problem was reported by John Hughes.