Are there any known security problems with NCSA httpd?
Versions of NCSA httpd prior to 1.4 contain a serious security hole relating to a fixed-size string buffer. Remote users could break into systems running this server by requesting an extremely long URL. Although this bug has been well publicized for more than a year, many sites are still running unsafe versions of the server. The current version of the software, version 1.5, does not suffer from this bug and is available at the link given at the beginning of this paragraph.