New critical vulnerabilities have been discovered in the free programs distributed from the Mozilla Foundation. Such products include the popular browser Firefox (version 1.5.x, version 2.0 is not affected) and the email client Thunderbird.  The most critical vulnerability could allow remote code execution.

Mozilla has published updated program versions which have corrected these known vulnerabilities.

More information is available on Mozilla.org's web site from the following links:

• Mozilla Foundation Security Advisories
• Known Vulnerabilities in Mozilla Products

Norman advices all affected users to download the updates as soon as possible, to be protected from potential exploits.