CVE-2014-5117
Tor before 0.2.4.23 and 0.2.5 before 0.2.5.6-alpha maintains a circuit after an inbound RELAY_EARLY cell is received by a client, which makes it easier for remote attackers to conduct traffic-confirmation attacks by using the pattern of RELAY and RELAY_EARLY cells as a means of communicating information about hidden service names.
Date published : 2014-07-30
https://blog.torproject.org/blog/tor-security-advisory-relay-early-traffic-confirmation-attack