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UBUNTU-CVE-2021-43527

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UBUNTU-CVE-2021-43527

Published: 1 Dec 2021Last Modified: 22 Apr 2026

Upstream:

Aliases:

Summary:

Details: NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS \#7, or PKCS \#12 are likely to be impacted. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how they configure NSS. *Note: This vulnerability does NOT impact Mozilla Firefox.* However, email clients and PDF viewers that use NSS for signature verification, such as Thunderbird, LibreOffice, Evolution and Evince are believed to be impacted. This vulnerability affects NSS < 3.73 and NSS < 3.68.1.

References: https://ubuntu.com/security/CVE-2021-43527, https://ubuntu.com/security/notices/USN-5168-1, https://ubuntu.com/security/notices/USN-5168-2, https://ubuntu.com/security/notices/USN-5168-3, https://ubuntu.com/security/notices/USN-5168-4, https://www.cve.org/CVERecord?id=CVE-2021-43527

Affected packages

Package

Name: nss

Purl: pkg:deb/ubuntu/nss@2:3.28.4-0ubuntu0.14.04.5+esm10?arch=source&distro=trusty/esm

Affected ranges

Type: ECOSYSTEM

Events:

Introduced- 0

Fixed -2:3.28.4-0ubuntu0.14.04.5+esm10

Affected versions

2:3.15.1-1ubuntu1

2:3.15.2-1

2:3.15.3-1

2:3.15.3.1-1

2:3.15.3.1-1.1

2:3.15.3.1-1.1ubuntu1

2:3.15.4-1ubuntu3

2:3.15.4-1ubuntu4

2:3.15.4-1ubuntu5

2:3.15.4-1ubuntu6

2:3.15.4-1ubuntu7

2:3.15.4-1ubuntu7.1

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High