The remote host is missing an update to subversion announced via advisory USN-1096-1.
Details follow:
Philip Martin discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain requests containing a lock token. A remote attacker could use this flaw to cause the service to crash, leading to a denial of service.
Solution: The problem can be corrected by upgrading your system to the following package versions:
After a standard system update you need to restart any applications that use Subversion, such as Apache when using mod_dav_svn, to make all the necessary changes.