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CVE-2021-43535 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=1667102	CVE	Issue TrackingPermissions RequiredVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html	CVE	Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	CVE	Mailing ListThird Party Advisory
https://www.debian.org/security/2021/dsa-5026	CVE	Third Party Advisory
https://www.debian.org/security/2022/dsa-5034	CVE	Issue TrackingThird Party Advisory
https://www.mozilla.org/security/advisories/mfsa2021-43/	CVE	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-49/	CVE	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-50/	CVE	Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1667102	[email protected]	Issue TrackingPermissions RequiredVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html	[email protected]	Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	[email protected]	Mailing ListThird Party Advisory
https://www.debian.org/security/2021/dsa-5026	[email protected]	Third Party Advisory
https://www.debian.org/security/2022/dsa-5034	[email protected]	Issue TrackingThird Party Advisory
https://www.mozilla.org/security/advisories/mfsa2021-43/	[email protected]	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-49/	[email protected]	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-50/	[email protected]	Vendor Advisory

see all 16 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	[email protected]

Affected Products

Product	Versions
mozilla firefox	< 93.0
CPE cpe:2.3:a:mozilla:firefox:::::::: Remediation No remediation found in references.
mozilla firefox esr	< 91.3.0
CPE cpe:2.3:a:mozilla:firefox_esr:::::::: Remediation No remediation found in references.
mozilla thunderbird	< 91.3.0
CPE cpe:2.3:a:mozilla:thunderbird:::::::: Remediation No remediation found in references.
debian debian linux	9.0 10.0 11.0
CPE cpe:2.3:o:debian:debian_linux:9.0:::::::* cpe:2.3:o:debian:debian_linux:10.0:::::::* cpe:2.3:o:debian:debian_linux:11.0:::::::* Remediation No remediation found in references.

Change History

10 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Mar 17, 2022	Modified Analysis	[email protected]
Jan 4, 2022	CVE Modified	[email protected]
Jan 3, 2022	CVE Modified	[email protected]
Dec 29, 2021	CVE Modified	[email protected]
Dec 21, 2021	Modified Analysis	[email protected]
Dec 20, 2021	CVE Modified	[email protected]
Dec 10, 2021	Initial Analysis	[email protected]

CVE-2021-43535 Details

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Affected Products

CPE

Remediation

CPE

Remediation

CPE

Remediation

CPE

Remediation

Change History

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