Description:

Mozilla has published the advisories (MFSA2021-48 and MFSA2021-49) to address multiple vulnerabilities in Firefox browser. A remote attacker could entice a user running a vulnerable browser to visit a web page with specially crafted content to exploit the vulnerabilities.

Affected Systems:

• Firefox ESR Windows versions prior to version 91.3
• Firefox Windows versions prior to version 94

Impact:

Successful exploitation of the vulnerabilities could lead to arbitrary code execution, privilege escalation, information disclosure, security restriction bypass, spoofing, or application crash on an affected system.

Recommendation:

Mozilla has released new versions of the product to address the issues and they can be downloaded at the following URLs:

• Firefox 94 for Windows
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
• Firefox ESR 91.3 for Windows
https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr

Users of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.

More Information:

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/
• https://www.hkcert.org/security-bulletin/mozilla-firefox-multiple-vulnerabilities_20211103
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38503 (to CVE-2021-38510)