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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 68 | 68 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nss | 2:3.45-1 | — |
| Debian 13 | nss | 2:3.45-1 | — |
| Debian 12 | nss | 2:3.45-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 68.0+build3-0ubuntu0.18.04.1 | USN-4054-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | nss | 2:3.35-2ubuntu2.3 | USN-4060-1 |
| Ubuntu 16.04 LTS | firefox | 68.0+build3-0ubuntu0.16.04.1 | USN-4054-1 |
| Ubuntu 16.04 LTS | nss | 2:3.28.4-0ubuntu0.16.04.6 | USN-4060-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.16.04.2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nspr +1 | 4.21.0-2.el8_0 | RHSA-2019:1951 |
| RHEL 8 | nss +9 | 3.44.0-7.el8_0 | RHSA-2019:1951 |
| RHEL 7 | nspr +1 | 4.25.0-2.el7_9 | RHSA-2020:4076 |
| RHEL 7 | nss +4 | 3.53.1-3.el7_9 | RHSA-2020:4076 |
| RHEL 7 | nss-softokn +3 | 3.53.1-6.el7_9 | RHSA-2020:4076 |
| RHEL 7 | nss-util +1 | 3.53.1-1.el7_9 | RHSA-2020:4076 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 68.1.0-3.54.2 | SUSE-SU-2019:2545-1 |
| SLES 15 SP1 | MozillaFirefox-branding-SLE | 68-4.8.5 | SUSE-SU-2019:2545-1 |
| SLES 15 SP1 | MozillaThunderbird | 68.1.1-3.51.1 | SUSE-SU-2019:2515-1 |
| SLES 15 | MozillaFirefox | 68.1.0-3.54.2 | SUSE-SU-2019:2545-1 |
| SLES 15 | MozillaFirefox-branding-SLE | 68-4.8.5 | SUSE-SU-2019:2545-1 |
| SLES 15 | MozillaThunderbird | 68.1.1-3.51.1 | SUSE-SU-2019:2515-1 |
| SLES 12 SP5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP4 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP3 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP3 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP1 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP1 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 11 SP4 | MozillaFirefox | 68.2.0-78.51.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 68-21.9.8 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-atk | 2.26.1-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-cairo | 1.15.10-2.13.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gdk-pixbuf | 2.36.11-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-glib2 | 2.54.3-2.14.7 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gtk3 | 3.10.9-2.15.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-harfbuzz | 1.7.5-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi | 3.2.1.git259-2.3.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi-gcc5 | 5.3.1+r233831-14.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-pango | 1.40.14-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nspr | 4.21-29.6.1 | SUSE-SU-2020:14418-1, SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nss | 3.45-38.9.3 | SUSE-SU-2020:14418-1, SUSE-SU-2019:14246-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP3 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP2 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP1 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Tumbleweed | mozilla-nss | 3.69.1-1.2 | openSUSE-SU-2024:11058-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 68.1.0-lp151.2.14.1 | openSUSE-SU-2019:2251-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.1.1-lp151.2.13.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.1 | enigmail | 2.1.2-lp151.2.6.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 68.1.0-lp150.3.66.1 | openSUSE-SU-2019:2260-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 68.1.1-lp150.3.51.1 | openSUSE-SU-2019:2248-1 |
| openSUSE Leap 15.0 | enigmail | 2.1.2-lp150.34.1 | openSUSE-SU-2019:2248-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nspr +1 | 4.25.0-2.amzn2 | ALAS2-2020-1559 |
| Amazon Linux 2 | nss +4 | 3.53.1-3.amzn2 | ALAS2-2020-1559 |
| Amazon Linux 2 | nss-softokn +3 | 3.53.1-6.amzn2 | ALAS2-2020-1559 |
| Amazon Linux 2 | nss-util +1 | 3.53.1-1.amzn2 | ALAS2-2020-1559 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | nspr +1 | 4.21.0-2.el8_0 | ELSA-2019-1951 |
| Oracle Linux 8 | nss +9 | 3.44.0-7.el8_0 | ELSA-2019-1951 |
| Oracle Linux 7 | nspr +1 | 4.25.0-2.el7_9 | ELSA-2020-4076 |
| Oracle Linux 7 | nss +4 | 3.53.1-3.el7_9 | ELSA-2020-4076 |
| Oracle Linux 7 | nss-softokn +3 | 3.53.1-6.0.1.el7_9 | ELSA-2020-4076 |
| Oracle Linux 7 | nss-util +1 | 3.53.1-1.el7_9 | ELSA-2020-4076 |
Advisories 21
- RHSA-2020:4076 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2019:1951 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4054-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4060-1 nss vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2019:2249-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14418-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2248-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11058-1 libfreebl3-3.69.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2260-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2251-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2545-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2620-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14246-1 Security update for Mozilla Firefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2515-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0459 Mozilla Firefox/Firefox ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 2, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ALAS2-2020-1559 Moderate: nspr security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 11, 2020
- ELSA-2020-4076 Moderate: nss and nspr security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 8, 2020
- ELSA-2019-1951 Moderate: nss and nspr security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 5, 2019
References
- https://www.mozilla.org/security/advisories/mfsa2019-21/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1552208
- RHSA-2019:1951 vendor-advisory
- GLSA-201908-12 vendor-advisory
- openSUSE-SU-2019:2248 vendor-advisory
- openSUSE-SU-2019:2249 vendor-advisory
- openSUSE-SU-2019:2251 vendor-advisory
- openSUSE-SU-2019:2260 vendor-advisory
- openSUSE-SU-2020:0008 vendor-advisory