CVE-2009-1300
apt 0.7.20 does not check when the date command returns an "invalid date" error, which can prevent apt from loading security updates in time zones for which DST occurs at midnight.
Date published : 2009-04-16
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=523213
https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/354793