CVE-2021-43535
Mozilla: Use-after-free in HTTP2 Session object
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Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · November 2, 2021
Updated · November 21, 2025
Description
The Mozilla Foundation Security Advisory describes this flaw as:
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.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 · Use After Free