Apache HTTP Server mod_dav denial of service

apache-mod-dav-dos (10208) The risk level is classified as MediumMedium Risk


Apache HTTP Server is vulnerable to a denial of service attack, caused by a vulnerability in the mod_dav distributed authoring and versioning (DAV) module. A remote attacker using a WebDAV client could send a malformed HTTP request to a vulnerable server to cause the web_dav module to reference a NULL pointer and consume all available CPU resources.


Denial of Service


Upgrade to the latest version of Apache HTTP Server (2.0.42 or later), available from the Apache Web site. See References.


  • Apache HTTP Server Project Web site: Apache HTTPD Project - The Apache HTTPD Server Project.
  • WebDAV Web site: mod_dav: a DAV module for Apache.
  • BID-5816: Apache 2 mod_dav Denial Of Service Vulnerability
  • CVE-2002-1593: mod_dav in Apache before 2.0.42 does not properly handle versioning hooks, which may allow remote attackers to kill a child process via a null dereference and cause a denial of service (CPU consumption) in a preforked multi-processing module.
  • OSVDB ID: 14896: mod_dav for Apache HTTP Server Remote Null Dereference Child Process Termination
  • SECTRACK ID: 1005285: Apache Web Server `mod_dav` Has Null Pointer Bug That May Allow Remote Users to Cause Denial of Service Conditions
  • US-CERT VU#406121: Apache mod_dav module vulnerable to DoS

Platforms Affected:

  • Apache HTTP Server 2.0
  • Apache HTTP Server 2.0.28
  • Apache HTTP Server 2.0.32
  • Apache HTTP Server 2.0.35
  • Apache HTTP Server 2.0.36
  • Apache HTTP Server 2.0.37
  • Apache HTTP Server 2.0.38
  • Apache HTTP Server 2.0.39
  • Apache HTTP Server 2.0.40
  • Apache HTTP Server 2.0.41


Sep 25, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page