CVE-2019-11727

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-11727

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-11727.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201907-4

OS impact

OS	Version	Status	Fixed in
arch		fixed	`68.0-1`
sles		affected
debian	sid	fixed	`68.0-1`
debian	bookworm	fixed	`2:3.45-1`
debian	bullseye	fixed	`2:3.45-1`
debian	forky	fixed	`2:3.45-1`
debian	trixie	fixed	`2:3.45-1`

References

Verify integrity in audit chain (admin only). AS-IS.