From Fedora Project Wiki

Security Impact of SELinux

SELinux has managed to prevent or minimize the damage caused by security issues in several software components. Here is a short (possibly incomplete) list of some of the issues.

Date Security Issue

2008 Apr Flash Vulnerability
2008 Jan !OpenPegasus Services
2007 Oct Plip Security Flaw
2007 Jul Mambo Exploit
2007 Jun Apache DoS
2007 May Samba Buffer Overflow
2006 Jul Local Privilege Escalation
2006 Mar Sendmail Code Execution
2005 Jul PHP XML-RPC Remote Code
2005 Mar Sendmail Code Execution