High severity · published Nov 3, 2021
CVE-2021-38496
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash
8.8
CVSS
1.7%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 93.0; 91.0 before 91.2 · source: NVD
DL
Debian Linux · Debian
9.0; 10.0; 11.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.15 · source: NVD
TH
Thunderbird · Mozilla
before 78.15; 91.0 before 91.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38496
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-38496
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/
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