Gabber 0.8.7 sends an email to a specific address during user login and logout, which allows remote attackers to obtain user session activity and Gabber version number by sniffing.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11115
http://www.securityfocus.com/bid/6624
http://archives.neohapsis.com/archives/bugtraq/2003-01/0179.html