CVE-2021-29946

Name of the Vulnerable Software and Affected Versions: Firefox ESR versions prior to 78.10 Thunderbird versions prior to 78.10 Firefox versions prior to 88

Description: The issue exists due to insufficient input validation, allowing a remote attacker to bypass security restrictions. This can be exploited when using the Alt-Svc header with ports written as an integer overflow above the bounds of a 16-bit integer, potentially bypassing port blocking restrictions.

Recommendations: For Firefox ESR versions prior to 78.10, update to version 78.10 or later. For Thunderbird versions prior to 78.10, update to version 78.10 or later. For Firefox versions prior to 88, update to version 88 or later.