CVE-2021-43529
9.8
CRITICAL
CVSS 3.1
EPSS 0.33%
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.
How to fix CVE-2021-43529
To remediate CVE-2021-43529, upgrade the affected package to a fixed version below.
- Debian/thunderbird—upgrade to 1:91.4.1-1~deb11u1 or later
Is CVE-2021-43529 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1:91.4.1-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |