CVE-2021-43534
moderate-risk
Published 2021-12-08
Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Do I need to act?
~
1.2% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10
High
NETWORK
/ LOW complexity
Affected Products (6)
References (16)
Third Party Advisory
https://www.debian.org/security/2021/dsa-5026
Issue Tracking
https://www.debian.org/security/2022/dsa-5034
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-48/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-49/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-50/
Third Party Advisory
https://www.debian.org/security/2021/dsa-5026
Issue Tracking
https://www.debian.org/security/2022/dsa-5034
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-48/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-49/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-50/
47
/ 100
moderate-risk
Severity
30/34 · Critical
Exploitability
4/34 · Minimal
Exposure
13/34 · Low