The MITRE CVE dictionary describes this issue as:
Multiple unspecified vulnerabilities in the layout engine for Mozilla Firefox 2.x before 220.127.116.11, 1.5.x before 18.104.22.168, Thunderbird before 22.214.171.124, and SeaMonkey before 1.0.7 allow remote attackers to cause a denial of service (memory corruption and crash) and possibly execute arbitrary code via unknown attack vectors.
Red Hat security errata
|Red Hat Enterprise Linux version 2.1 (seamonkey)||RHSA-2006:0759||December 19, 2006|
|Red Hat Enterprise Linux version 3 (seamonkey)||RHSA-2006:0759||December 19, 2006|
|Red Hat Enterprise Linux version 4||RHSA-2006:0759||December 19, 2006|
|Red Hat Enterprise Linux version 4 (firefox)||RHSA-2006:0758||December 19, 2006|
|Red Hat Enterprise Linux version 4 (thunderbird)||RHSA-2006:0760||December 19, 2006|
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For clarification or corrections please contact the Red Hat Security Response Team.