CVE-2019-11727

MEDIUM

Firefox < 68.0 - Improper Certificate Validation via PKCS#1 v1.5 Signatures in TLS 1.3

Title source: llm

Description

A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.

References (9)

Core 9

Core References

Vendor Advisory x_refsource_misc

https://www.mozilla.org/security/advisories/mfsa2019-21/

Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc

https://bugzilla.mozilla.org/show_bug.cgi?id=1552208

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2019:1951

Third Party Advisory vendor-advisory x_refsource_gentoo

https://security.gentoo.org/glsa/201908-12

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html

Scores

CVSS v3 5.3

EPSS 0.0024

EPSS Percentile 47.6%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Details

CWE

CWE-295

Status published

Products (1)

mozilla/firefox < 68.0

Published Jul 23, 2019

Tracked Since Feb 18, 2026