Here is a collection of security advisories that grok.org.uk has been involved in one way or another...

29th June 2004

DoS in popclient 3.0b6 [ CVE-2004-0666 ] (Vulnerability identified by Dean White)

9th February 2005

Mailman 2.1.x Directory Traversal Vulnerability [ CVE-2005-0202 ] (Vulnerability identified by Marcus Meissner, SuSE Linux)

1st June 2005

HP Radia Notify Daemon: Multiple Buffer Overflow Vulnerabilities [ CVE-2005-1825 | CVE-2005-1826 ] (The HP Advisory provides further information)

2nd April 2013

PonyOS Security Issues (Not entirely serious!)