Unspecified vulnerability in the directory server (dirserver) in Tor before 0.1.1.20 allows remote attackers to cause an unspecified denial of service via unknown vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26794
http://www.securityfocus.com/bid/18323
http://tor.eff.org/cvs/tor/ChangeLog
http://security.gentoo.org/glsa/glsa-200606-04.xml