Mozilla products will crash when parsing an iframe tag with a bad source address. If malicious HTML content contains a certain source address in an iframe tag, it will cause the browser to crash due to an invalid memory read.
This is public via: http://www.mozilla.org/security/announce/2011/mfsa2011-12.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Via RHSA-2011:0473 https://rhn.redhat.com/errata/RHSA-2011-0473.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2011:0475 https://rhn.redhat.com/errata/RHSA-2011-0475.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2011:0474 https://rhn.redhat.com/errata/RHSA-2011-0474.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 4 Via RHSA-2011:0471 https://rhn.redhat.com/errata/RHSA-2011-0471.html