CVE-2021-38496

moderate-risk
Published 2021-11-03

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. 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)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
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/
Broken Link https://www.mozilla.org/security/advisories/mfsa2021-46/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2021-47/
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
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/
Broken Link 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