High severity · published Nov 3, 2021
CVE-2021-38498
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash
7.5
CVSS
1.5%
EPSS
No
On KEV
Description
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% 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 · source: NVD
FE
Firefox Esr · Mozilla
before 91.2 · source: NVD
TH
Thunderbird · Mozilla
before 91.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38498
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-38498
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1729642
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-43/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-45/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-47/
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