A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.

Related CVEs

CVE-2021-43535

Key Information

GHSA ID

GHSA-9c2c-v6c7-rjgv

Published

December 9, 2021 12:00 AM

Last Modified

March 18, 2022 12:01 AM

CVSS Score

7.5 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: June 12, 2025 6:24 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.