Read the docs
TI-2019-08786 Aliases CVE-2019-11727GHSA-pwq5-w788-7w28

Improper certificate validation in Mozilla Firefox

Priority LOW 28CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
None · Low · None
Fix status
Partial Red Hat: 9 fixed, 2 without a fix

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-295.

Summary

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.

Why it matters now

EPSS 0.01812 78th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 68Red Hat: 3 advisoriesRed Hat: 9 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 6868Patch availableCNA
  • Firefox VendorMozilla Affected before 68 Fixed in 68 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 68.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 68.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 68

Red Hat 3 advisories

  • RHSA-2021:0949 Released 2021-03-22 · Red Hat rating Low
    Red Hat OpenShift Do openshift/odo-init-image 1.1.3 security update
    • OpenShift Do 1 openshiftdo/odo-init-image-rhel7
  • RHSA-2020:4076 Released 2020-09-29 · Red Hat rating Moderate
    nss and nspr security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) nspr-4.25.0-2.el7_9, nss-3.53.1-3.el7_9, nss-softokn-3.53.1-6.el7_9 +4
    • Red Hat Enterprise Linux Client Optional (v. 7) nspr-devel-4.25.0-2.el7_9, nss-devel-3.53.1-3.el7_9, nss-pkcs11-devel-3.53.1-3.el7_9 +3
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) nspr-devel-4.25.0-2.el7_9, nss-devel-3.53.1-3.el7_9, nss-pkcs11-devel-3.53.1-3.el7_9 +3
    • Red Hat Enterprise Linux Server (v. 7) nspr-4.25.0-2.el7_9, nspr-4.25.0-2.el7_9.ppc, nspr-devel-4.25.0-2.el7_9 +19
    • Red Hat Enterprise Linux Server Optional (v. 7) nss-pkcs11-devel-3.53.1-3.el7_9, nss-pkcs11-devel-3.53.1-3.el7_9.ppc
    • Red Hat Enterprise Linux Workstation (v. 7) nspr-4.25.0-2.el7_9, nspr-devel-4.25.0-2.el7_9, nss-3.53.1-3.el7_9 +9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) nss-pkcs11-devel-3.53.1-3.el7_9
  • RHSA-2019:1951 Released 2019-07-30 · Red Hat rating Moderate
    nss and nspr security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) nspr-4.21.0-2.el8_0, nspr-devel-4.21.0-2.el8_0, nss-3.44.0-7.el8_0 +9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Mozilla Firefox — GLSA-201908-12

    23 records Highest priority Priority CRITICAL 2 CRITICAL, 8 MEDIUM, 13 LOW

    Other records, highest priority first

    • TI-2019-08769 Improper input validation in Mozilla Firefox ESRPriority CRITICAL 100
    • TI-2019-08768 Type confusion in Mozilla Firefox ESRPriority CRITICAL 97
    • TI-2019-08789 A vulnerability exists where if a user opens a locally saved HTML file, this file can use…Priority MEDIUM 48
    Show all 23 records → Advisory →
  • Advisory ·

    Mozilla Firefox — RHSA-2019:1951

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2019-08788 Memory corruption in Mozilla Firefox ESRPriority LOW 38
    • TI-2019-08780 Out-of-bounds read in Mozilla Firefox ESRPriority LOW 37
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
OpenShift Do 1Fixed RHSA-2021:0949
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2019:1951
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:4076

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-11727
  2. 2026-10-03 Alias added: GHSA-pwq5-w788-7w28

References

Advisory 9

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences