Critical severity · published Feb 16, 2023
CVE-2021-43529
Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TH
Thunderbird · Mozilla
before 91.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43529
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43529
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-43529
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