The remote host is missing an update to subversion announced via advisory DSA 2181-1.

For the oldstable distribution (lenny), this problem has been fixed in version 1.5.1dfsg1-6. For the stable distribution (squeeze), this problem has been fixed in version 1.6.12dfsg-5. For the testing distribution (wheezy) and the unstable distribution (sid), this problem will be fixed in version 1.6.16dfsg-1. We recommend that you upgrade your subversion packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202181-1

Philip Martin discovered that HTTP-based Subversion servers crash when processing lock requests on repositories which support unauthenticated read access.