CVE-2021-43529 — Out-of-bounds Write in Mozilla Thunderbird

CWE-787 — Out-of-bounds WriteCWE-120 — Classic Buffer Overflow7 documents7 sources
Severity
9.8CRITICALNVD
EPSS
0.3%
top 43.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla ThunderbirdDebian ThunderbirdMozilla Firefox
Timeline
PublishedFeb 16
Latest updateFeb 17

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:HExploitability: 3.9 | Impact: 5.9

Affected Packages4 packages

▶debiandebian/thunderbird< thunderbird 1:91.3.0-1 (bookworm)
▶NVDmozilla/thunderbird< 91.3.0
▶Debianmozilla/thunderbird< 1:91.4.1-1~deb11u1+3
▶mozillamozilla/firefox

🔴Vulnerability Details

2
GHSA
GHSA-82q7-2fg2-4gcj: Thunderbird versions prior to 91↗2023-02-17
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OSV
CVE-2021-43529: Thunderbird versions prior to 91↗2023-02-16
▶

📋Vendor Advisories

3
Red Hat
thunderbird: Memory corruption when processing S/MIME messages↗2021-12-01
▶
Debian
CVE-2021-43529: thunderbird - Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow describ...↗2021
▶
Mozilla
Mozilla Foundation Security Advisory 2021-50: CVE-2021-43529↗
▶

💬Community

1
Bugzilla
Automatic S/MIME cert import should use additional verification using mozilla::pkix↗2021-10-29
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CVE-2021-43529 — Out-of-bounds Write in Mozilla | cvebase