PT-2021-23859 · Mozilla+5 · Thunderbird+5

Tavis Ormandy · Published 2021-11-03 · Updated 2025-03-19 · CVE-2021-43529

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Thunderbird versions prior to 91.3.0

Description The issue is related to a heap overflow when processing S/MIME messages, specifically those containing certificates with DER-encoded DSA or RSA-PSS signatures.

Recommendations For Thunderbird versions prior to 91.3.0, update to version 91.3.0 or later to resolve the issue.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2021-3226

ALT-PU-2021-3259

ALT-PU-2021-3370

ALT-PU-2022-1783

CESA-2021_4130

CESA-2021_4134

CVE-2021-43529

DLA-2874-1

DSA-5034-1

RHSA-2021:4130

RHSA-2021:4132

RHSA-2021:4133

RHSA-2021:4134

RHSA-2021_4130

RHSA-2021_4134

RLSA-2021:4130

Affected Products

Alt Linux

Astra Linux

Centos

Red Hat

Rocky Linux

Thunderbird

References · 28

• https://nvd.nist.gov/vuln/detail/CVE-2021-43529 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43529 · Security Note
• https://ubuntu.com/security/CVE-2021-43529 · Vendor Advisory
• https://osv.dev/vulnerability/RLSA-2021:4130 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2021:4130 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5034-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-43529 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-43529 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-43529 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2874-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-43529 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-43529 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2021-50 · Vendor Advisory
• https://access.redhat.com/security/vulnerabilities/RHSB-2021-008 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2019626 · Note