CVE-2021-43534: Mozilla Firefox

Mozilla Firefox: Mozilla developers and community members reported memory safety bugs present in Firefox…

No CVSS scoreEPSS 0.012 · 69th percentile

Published by the CVE Program (CNA: mozilla) at 8 Dec 2021, 21:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Mozilla	Firefox	affected unspecified to before 94 custom
Mozilla	Thunderbird	affected unspecified to before 91.3 custom
Mozilla	Firefox ESR	affected unspecified to before 91.3 custom

Identifiers

CVE-2021-43534

CNA

mozilla

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.012, the 69th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 8 Dec 2021. New records show when each source confirmed them.

Sources

References from the CNA

www.mozilla.org/security/advisories/mfsa2021-49/
www.mozilla.org/security/advisories/mfsa2021-50/
www.mozilla.org/security/advisories/mfsa2021-48/
bugzilla.mozilla.org/buglist.cgi?bug_id=1606864%2C1712671%2C1730048%2C1735152
www.debian.org/security/2021/dsa-5026 vendor-advisorydebian
lists.debian.org/debian-lts-announce/2021/12/msg00030.html mailing-listmlist
www.debian.org/security/2022/dsa-5034 vendor-advisorydebian
lists.debian.org/debian-lts-announce/2022/01/msg00001.html mailing-listmlist

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.