If you use Squirrelmail on your Redhat based servers be sure to upgrade.
RHSA-2009:1490-1: Moderate: squirrelmail security update: "Red Hat Enterprise Linux: An updated squirrelmail package that fixes several security issues is now
available for Red Hat Enterprise Linux 3, 4, and 5.
This update has been rated as having moderate security impact by the Red
Hat Security Response Team. CVE-2009-2964"