CVE-2021-38500

moderate-risk
Published 2021-11-03

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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 Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

Do I need to act?

~
1.1% 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)

Affected Vendors

Debian Mozilla

References (16)

Broken Link https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321
Mailing List https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
Issue Tracking https://www.debian.org/security/2022/dsa-5034
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-43/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-44/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-45/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-46/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-47/
Broken Link https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321
Mailing List https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
Issue Tracking https://www.debian.org/security/2022/dsa-5034
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-43/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-44/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-45/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-46/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-47/
46
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 3/34 · Minimal
Exposure 13/34 · Low