Buffer overflow in Mozilla Thunderbird
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. 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.
Vulnerability class: Buffer Overflow
EPSS: 0.005 (38.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- security@mozilla.org (Issue Tracking)
Frequently asked questions
- What is CVE-2021-43529?
- CVE-2021-43529 is a critical-severity vulnerability in Mozilla Thunderbird, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-02-16.
- How severe is CVE-2021-43529?
- Critical severity. CVSS v3 base score is 9.8 out of 10.