Mozilla has released Firefox 4.0.1, 3.6.17, and 3.5.19 to address multiple vulnerabilities.  The impact of these vulnerabilities includes arbitrary code execution, privilege escalation, directory traversal, and information disclosure.

US-CERT encourages users and administrators to review the Mozilla Foundation Security Advisories for April 28, 2011 and apply any necessary updates to mitigate the risks.

Read more: US-CERT Current Activity