What is the severity of CVE-2021-43529?

The severity of CVE-2021-43529 is critical.

Which software versions are affected by CVE-2021-43529?

Thunderbird versions prior to 91.3.0 and certain Debian Thunderbird versions are affected.

How can I fix CVE-2021-43529?

Update Thunderbird to version 91.3.0 or later, or apply the appropriate Debian package upgrades.

What is the vulnerability description of CVE-2021-43529?

CVE-2021-43529 is a heap overflow vulnerability in Thunderbird when processing S/MIME messages.

Where can I find more information about CVE-2021-43529?

More information about CVE-2021-43529 can be found in the references provided.

Vulnerability/
CVE-2021-43529

critical

9.8

CWE

787

3/11/2021

16/2/2023

4/8/2024

CVE-2021-43529

First published: Wed Nov 03 2021(Updated: )

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.

Credit: security@mozilla.org

Affected Software	Affected Version	How to fix
Mozilla Thunderbird	<91.3	91.3
	<91.3	91.3
Mozilla Thunderbird	<91.3.0
debian/thunderbird		1:91.12.0-1~deb10u1 1:115.3.1-1~deb10u1 1:102.13.1-1~deb11u1 1:115.3.1-1~deb11u1 1:102.15.1-1~deb12u1 1:115.3.1-1~deb12u1 1:115.3.1-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

MFSA2021-50

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

What is the severity of CVE-2021-43529?
The severity of CVE-2021-43529 is critical.
Which software versions are affected by CVE-2021-43529?
Thunderbird versions prior to 91.3.0 and certain Debian Thunderbird versions are affected.
How can I fix CVE-2021-43529?
Update Thunderbird to version 91.3.0 or later, or apply the appropriate Debian package upgrades.
What is the vulnerability description of CVE-2021-43529?
CVE-2021-43529 is a heap overflow vulnerability in Thunderbird when processing S/MIME messages.
Where can I find more information about CVE-2021-43529?
More information about CVE-2021-43529 can be found in the references provided.

collector/security-tracker-debian
collector/nvd-index
collector/mozilla-advisory
vendor/mozilla
vendor/thunderbird
agent/type
agent/last-modified-date
agent/first-publish-date
agent/softwarecombine
agent/author
agent/severity
agent/references
agent/weakness
source/Mozilla
agent/software-canonical-lookup
agent/tags
agent/event
agent/description
collector/mitre-cve
source/MITRE
package-manager/debian
canonical/mozilla thunderbird

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