Description
Mozilla Firefox and Thunderbird do not properly handle onreadystatechange events in conjunction with page reloading, which allows remote attackers to cause a denial-of-service (DoS) or possibly execute malicious code via a crafted web site.
Recommended action
Apply updates per vendor instructions.
CISA remediation due date for U.S. federal agencies: 18 Apr 2022.
Collected automatically from public sources. Verify affected versions and fixes in the vendor's notice before acting.