Change your passwords
Comcast hushes about serious hack.
It appears that Comcast, the largest internet service provider in the United States, uses Zimbra as an internal communications platform. NullCrew exploited an unpatched security vulnerability, CVE-2013-7091, to gain access to usernames, passwords and other sensitive details from Comcast’s environment.
Comcast customers have not been not told to reset their passwords. But they should.