Description
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 68.9.0 | 68.9.0 |
| Mozilla | Firefox | unspecified – < 77 | 77 |
| Mozilla | Firefox ESR | unspecified – < 68.9 | 68.9 |
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 | firefox-esr | 68.9.0esr-1 | — |
| Debian 14 | nss | 2:3.53-1 | — |
| Debian 14 | thunderbird | 1:68.9.0-1 | — |
| Debian 13 | firefox-esr | 68.9.0esr-1 | — |
| Debian 13 | nss | 2:3.53-1 | — |
| Debian 13 | thunderbird | 1:68.9.0-1 | — |
| Debian 12 | firefox-esr | 68.9.0esr-1 | — |
| Debian 12 | nss | 2:3.53-1 | — |
| Debian 12 | thunderbird | 1:68.9.0-1 | — |
| Debian 10 | firefox-esr | 68.9.0esr-1~deb10u1 | DSA-4695-1 |
| Debian 10 | nss | 2:3.42.1-1+deb10u3 | DSA-4726-1 |
| Debian 10 | thunderbird | 1:68.9.0-1~deb10u1 | DSA-4702-1 |
| Debian 9 | firefox-esr | 68.9.0esr-1~deb9u1 | DSA-4695-1 |
| Debian 9 | nss | 2:3.26.2-1.1+deb9u2 | DLA-2388-1 |
| Debian 9 | thunderbird | 1:68.9.0-1~deb9u1 | DSA-4702-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | firefox-esr | 68.9.0esr-1~deb8u2 | DLA-2243-1 |
| Debian 8 | nss | 2:3.26-1+debu8u11 | DLA-2266-1 |
| Debian 8 | thunderbird | 1:68.9.0-1~deb8u2 | DLA-2247-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firefox | 77.0.1+build1-0ubuntu0.20.04.1 | USN-4383-1 |
| Ubuntu 20.04 LTS | nss | 2:3.49.1-1ubuntu1.1 | USN-4397-1 |
| Ubuntu 20.04 LTS | thunderbird | 1:68.10.0+build1-0ubuntu0.20.04.1 | USN-4421-1 |
| Ubuntu 18.04 LTS | firefox | 77.0.1+build1-0ubuntu0.18.04.1 | USN-4383-1 |
| Ubuntu 18.04 LTS | nss | 2:3.35-2ubuntu2.8 | USN-4397-1 |
| Ubuntu 18.04 LTS | thunderbird | 1:68.10.0+build1-0ubuntu0.18.04.1 | USN-4421-1 |
| Ubuntu 16.04 LTS | firefox | 77.0.1+build1-0ubuntu0.16.04.1 | USN-4383-1 |
| Ubuntu 16.04 LTS | nss | 2:3.28.4-0ubuntu0.16.04.11 | USN-4397-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.10.0+build1-0ubuntu0.16.04.1 | USN-4421-1 |
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+esm5 | USN-4397-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nspr +1 | 4.25.0-2.el8_2 | RHSA-2020:3280 |
| RHEL 8 | nss +9 | 3.53.1-11.el8_2 | RHSA-2020:3280 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | nspr | 4.25.0-2.el8_2 | RLSA-2020:3280 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | mozilla-nspr | 4.25-3.12.1 | SUSE-SU-2020:1677-1 |
| SLES 15 SP2 | mozilla-nss | 3.53-3.40.1 | SUSE-SU-2020:1677-1 |
| SLES 15 SP1 | mozilla-nspr | 4.25-3.12.1 | SUSE-SU-2020:1677-1 |
| SLES 15 SP1 | mozilla-nss | 3.53-3.40.1 | SUSE-SU-2020:1677-1 |
| SLES 15 | mozilla-nspr | 4.25-3.12.1 | SUSE-SU-2020:1677-1 |
| SLES 15 | mozilla-nss | 3.53-3.40.1 | SUSE-SU-2020:1677-1 |
| SLES 12 SP5 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES 12 SP5 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLES 12 SP4 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES 12 SP4 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES 12 SP3 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLES 12 SP2 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES 12 SP2 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLES 11 SP4 | mozilla-nspr | 4.25-29.12.2 | SUSE-SU-2020:14418-1 |
| SLES 11 SP4 | mozilla-nss | 3.53.1-38.23.1 | SUSE-SU-2020:14418-1 |
| SLES for SAP 15 | mozilla-nspr | 4.25-3.12.1 | SUSE-SU-2020:1677-1 |
| SLES for SAP 15 | mozilla-nss | 3.53-3.40.1 | SUSE-SU-2020:1677-1 |
| SLES for SAP 12 SP5 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP5 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP4 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP4 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP3 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP2 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SLE HPC 15 | mozilla-nspr | 4.25-3.12.1 | SUSE-SU-2020:1677-1 |
| SLE HPC 15 | mozilla-nss | 3.53-3.40.1 | SUSE-SU-2020:1677-1 |
| SUSE OpenStack Cloud Crowbar 9 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud Crowbar 9 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud 9 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud 9 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud 8 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud 8 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud 7 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE OpenStack Cloud 7 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
| SUSE Enterprise Storage 5 | mozilla-nspr | 4.25-19.15.1 | SUSE-SU-2020:1839-1 |
| SUSE Enterprise Storage 5 | mozilla-nss | 3.53.1-58.48.1 | SUSE-SU-2020:1839-1 |
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 | mozilla-nspr | 4.25-lp151.2.9.1 | openSUSE-SU-2020:0854-1 |
| openSUSE Leap 15.1 | mozilla-nss | 3.53-lp151.2.23.1 | openSUSE-SU-2020:0854-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 77.0-r0 | — |
| Alpine v3.23 | firefox +1 | 77.0-r0 | — |
| Alpine v3.23 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.22 | firefox +1 | 77.0-r0 | — |
| Alpine v3.22 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.21 | firefox +1 | 77.0-r0 | — |
| Alpine v3.21 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.20 | firefox | 77.0-r0 | — |
| Alpine v3.20 | firefox-esr +1 | 68.9.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 77.0-r0 | — |
| Alpine v3.19 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.18 | firefox | 77.0-r0 | — |
| Alpine v3.18 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.17 | firefox | 77.0-r0 | — |
| Alpine v3.17 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.16 | firefox | 77.0-r0 | — |
| Alpine v3.16 | firefox-esr +1 | 68.9.0-r0 | — |
| Alpine v3.15 | firefox | 77.0-r0 | — |
| Alpine v3.15 | firefox-esr | 68.9.0-r0 | — |
| Alpine v3.14 | firefox | 77.0-r0 | — |
| Alpine v3.14 | firefox-esr | 68.9.0-r0 | — |
| Alpine v3.13 | firefox | 77.0-r0 | — |
| Alpine v3.13 | firefox-esr | 68.9.0-r0 | — |
| Alpine v3.12 | firefox | 77.0-r0 | — |
| Alpine v3.12 | mozjs68 +1 | 68.9.0-r0 | — |
| Alpine v3.11 | firefox-esr | 68.9.0-r0 | — |
Advisories 20
- RHSA-2020:3280 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4397-1 nss vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4421-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4397-2 nss vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4383-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4695-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4702-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4726-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2266-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2243-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2388-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2247-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2020:3280 Moderate: nss and nspr security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2020:14418-1 Security update for mozilla-nspr, mozilla-nss 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-2020:1839-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0854-1 Security update for mozilla-nspr, mozilla-nss 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
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1677-1 Security update for mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · May 2, 2025
References
- https://www.mozilla.org/security/advisories/mfsa2020-20/
- https://www.mozilla.org/security/advisories/mfsa2020-21/
- https://www.mozilla.org/security/advisories/mfsa2020-22/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1631576
- DSA-4726 vendor-advisory
- USN-4421-1 vendor-advisory
- GLSA-202007-49 vendor-advisory
- [debian-lts-announce] 20200929 [SECURITY] [DLA 2388-1] nss security update mailing-list