CVE-2019-11727

nss: PKCS#1 v1.5 signatures can be used for TLS 1.3

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Severity

Low

Red Hat Product Security

3.4

CVSS 3.0

Review impact separately from score.

Published · July 9, 2019

Updated · June 27, 2026

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 3.4
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm