apparently a serious vulnerability that needs to be patched immediately - affects Symantec firewalls, anti-spam, retail, and enterprise products.
from Slashdot...
http://it.slashdot.org/it/05/02/10/1327220.shtml?tid=172&tid=128
original article from ZDNet...
http://www.zdnet.com.au/news/security/0,2000061744,39180674,00.htm
Not sure if this is technically 'operational' but I'm sure it affects most of the people on this list.