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.
References (1)
Core 1
Core References
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-43529
Scores
CVSS v3
9.8
EPSS
0.0033
EPSS Percentile
55.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-787
Status
published
Products (1)
mozilla/thunderbird
< 91.3.0
Published
Feb 16, 2023
Tracked Since
Feb 18, 2026