Description
When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than the block size, a small out of bounds write could occur. This could have caused heap corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | before 68.3 | — |
| Mozilla | Firefox ESR | before 68.3 | — |
| Mozilla | Firefox | before 71 | — |
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 | 2:3.47.1-1 | — |
| Debian 13 | nss | 2:3.47.1-1 | — |
| Debian 12 | nss | 2:3.47.1-1 | — |
| Debian 10 | nss | 2:3.42.1-1+deb10u2 | DSA-4579-1 |
| Debian 9 | nss | 2:3.26.2-1.1+deb9u2 | DLA-2388-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | nss | 2:3.26-1+debu8u7 | DLA-2008-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | firefox | 71.0+build5-0ubuntu0.18.04.1 | USN-4216-1 |
| Ubuntu 18.04 LTS | nss | 2:3.35-2ubuntu2.5 | USN-4203-1 |
| Ubuntu 18.04 LTS | thunderbird | 1:68.4.1+build1-0ubuntu0.18.04.1 | USN-4241-1 |
| Ubuntu 16.04 LTS | firefox | 71.0+build5-0ubuntu0.16.04.1 | USN-4216-2 |
| Ubuntu 16.04 LTS | nss | 2:3.28.4-0ubuntu0.16.04.8 | USN-4203-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.16.04.2 | USN-4335-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | nss | 2:3.28.4-0ubuntu0.14.04.5+esm2 | USN-4203-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nss +9 | 3.44.0-9.el8_1 | RHSA-2019:4114 |
| RHEL 7 | nss +4 | 3.44.0-7.el7_7 | RHSA-2019:4190 |
| RHEL 7 | nss-softokn +3 | 3.44.0-8.el7_7 | RHSA-2019:4190 |
| RHEL 7 | nss-util +1 | 3.44.0-4.el7_7 | RHSA-2019:4190 |
| RHEL 6 | nss-softokn +3 | 3.44.0-6.el6_10 | RHSA-2019:4152 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.0 E4S | nss +9 | 3.44.0-8.el8_0 | RHSA-2020:0243 |
| RHEL 7.6 EUS | nss-softokn +3 | 3.36.0-6.el7_6 | RHSA-2020:1461 |
| RHEL 7.5 EUS | nss-softokn +3 | 3.36.0-6.el7_5 | RHSA-2020:1267 |
| RHEL 7.4 TUS | nss-softokn +3 | 3.28.3-9.el7_4 | RHSA-2020:1345 |
| RHEL 7.4 E4S | nss-softokn +3 | 3.28.3-9.el7_4 | RHSA-2020:1345 |
| RHEL 7.4 AUS | nss-softokn +3 | 3.28.3-9.el7_4 | RHSA-2020:1345 |
| RHEL 6.6 AUS | nss-softokn +3 | 3.14.3-23.el6_6 | RHSA-2020:0466 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 68.3.0-3.62.2 | SUSE-SU-2019:3337-1 |
| SLES 15 SP1 | MozillaThunderbird | 68.3.0-3.61.2 | SUSE-SU-2019:3339-1 |
| SLES 15 SP1 | mozilla-nspr | 4.23-3.9.1 | SUSE-SU-2019:3395-1 |
| SLES 15 SP1 | mozilla-nss | 3.47.1-3.22.1 | SUSE-SU-2019:3395-1 |
| SLES 15 | MozillaFirefox | 68.3.0-3.62.2 | SUSE-SU-2019:3337-1 |
| SLES 15 | MozillaThunderbird | 68.3.0-3.61.2 | SUSE-SU-2019:3339-1 |
| SLES 15 | mozilla-nspr | 4.23-3.9.1 | SUSE-SU-2019:3395-1 |
| SLES 15 | mozilla-nss | 3.47.1-3.22.1 | SUSE-SU-2019:3395-1 |
| SLES 12 SP5 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP5 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP5 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP4 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP4 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP4 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP3 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP3 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP3 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP2 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP2 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP1 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP1 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES 12 SP1 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES 11 SP4 | MozillaFirefox | 68.3.0-78.54.1 | SUSE-SU-2019:14260-1 |
| SLES 11 SP4 | mozilla-nspr | 4.23-29.9.1 | SUSE-SU-2020:14418-1, SUSE-SU-2019:14260-1 |
| SLES 11 SP4 | mozilla-nss | 3.47.1-38.12.1 | SUSE-SU-2020:14418-1, SUSE-SU-2019:14260-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP5 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP5 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP4 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP4 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP3 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP2 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP1 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE OpenStack Cloud 8 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SUSE OpenStack Cloud 8 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE OpenStack Cloud 7 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SUSE OpenStack Cloud 7 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE Enterprise Storage 5 | mozilla-nspr | 4.23-19.12.1 | SUSE-SU-2020:0088-1 |
| SUSE Enterprise Storage 5 | mozilla-nss | 3.47.1-58.34.1 | SUSE-SU-2020:0088-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mozilla-nss | 3.69.1-1.2 | openSUSE-SU-2024:11058-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 68.3.0-lp151.2.21.1 | openSUSE-SU-2020:0002-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.3.0-lp151.2.19.1 | openSUSE-SU-2020:0003-1 |
| openSUSE Leap 15.1 | mozilla-nspr | 4.23-lp151.2.6.1 | openSUSE-SU-2020:0008-1 |
| openSUSE Leap 15.1 | mozilla-nss | 3.47.1-lp151.2.9.1 | openSUSE-SU-2020:0008-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nss | 3.47.1-r0 | — |
| Alpine v3.23 | nss | 3.47.1-r0 | — |
| Alpine v3.22 | nss | 3.47.1-r0 | — |
| Alpine v3.21 | nss | 3.47.1-r0 | — |
| Alpine v3.20 | nss | 3.47.1-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nss | 3.47.1-r0 | — |
| Alpine v3.18 | nss | 3.47.1-r0 | — |
| Alpine v3.17 | nss | 3.47.1-r0 | — |
| Alpine v3.16 | nss | 3.47.1-r0 | — |
| Alpine v3.15 | nss | 3.47.1-r0 | — |
| Alpine v3.14 | nss | 3.47.1-r0 | — |
| Alpine v3.13 | nss | 3.47.1-r0 | — |
| Alpine v3.12 | nss | 3.47.1-r0 | — |
| Alpine v3.11 | nss | 3.47.1-r0 | — |
| Alpine v3.10 | nss | 3.44.3-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nss +4 | 3.44.0-7.amzn2 | ALAS2-2020-1384 |
| Amazon Linux 2 | nss-softokn +3 | 3.44.0-8.amzn2 | ALAS2-2020-1379 |
| Amazon Linux 2 | nss-util +1 | 3.44.0-4.amzn2 | ALAS2-2024-2470 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | nss +9 | 3.44.0-9.el8_1 | ELSA-2019-4114 |
| Oracle Linux 7 | nss +4 | 3.44.0-7.el7_7 | ELSA-2019-4190 |
| Oracle Linux 7 | nss-softokn +3 | 3.44.0-8.0.1.el7_7 | ELSA-2019-4190 |
| Oracle Linux 7 | nss-util +1 | 3.44.0-4.el7_7 | ELSA-2019-4190 |
Advisories 35
- RHSA-2020:1461 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2020:1267 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2020:1345 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2020:0466 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:0243 Red Hat Security Advisory: nss security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:4190 Red Hat Security Advisory: nss, nss-softokn, nss-util security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:4152 Red Hat Security Advisory: nss-softokn security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:4114 Red Hat Security Advisory: nss security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4335-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4241-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4216-2 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4216-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4203-1 nss vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4203-2 nss vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4579-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2008-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2388-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:14418-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3337-1 Security update for MozillaFirefox 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
- SUSE-SU-2019:3395-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0008-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0002-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14260-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3339-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3347-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0003-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0088-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2022-1826 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 19, 2024
- ALAS2-2024-2470 Important: nss-util security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 19, 2024
- ICSA-21-040-04 Siemens RUGGEDCOM ROX II CISA ICS & IT advisories · Feb 9, 2021
- ALAS2-2020-1384 Important: nss security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 17, 2020
- ALAS2-2020-1379 Moderate: nss-softokn security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 8, 2020
- ELSA-2019-4190 Important: nss, nss-softokn, nss-util security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 11, 2019
- ELSA-2019-4114 Important: nss security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 9, 2019
References
- https://www.mozilla.org/security/advisories/mfsa2019-36/
- https://www.mozilla.org/security/advisories/mfsa2019-38/
- https://www.mozilla.org/security/advisories/mfsa2019-37/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1586176
- openSUSE-SU-2020:0003 vendor-advisory
- openSUSE-SU-2020:0002 vendor-advisory
- openSUSE-SU-2020:0008 vendor-advisory
- USN-4241-1 vendor-advisory
- RHSA-2020:0243 vendor-advisory
- RHSA-2020:0466 vendor-advisory
- GLSA-202003-02 vendor-advisory
- GLSA-202003-10 vendor-advisory
- GLSA-202003-37 vendor-advisory
- USN-4335-1 vendor-advisory
- [debian-lts-announce] 20200929 [SECURITY] [DLA 2388-1] nss security update mailing-list
- https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04