Description
During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 78 | 78 |
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 | 2:3.53.1-1 | — |
| Debian 13 | nss | 2:3.53.1-1 | — |
| Debian 12 | nss | 2:3.53.1-1 | — |
| Debian 10 | nss | 2:3.42.1-1+deb10u3 | DSA-4726-1 |
| 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+debu8u11 | DLA-2266-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nss | 2:3.49.1-1ubuntu1.2 | USN-4417-1 |
| Ubuntu 18.04 LTS | nss | 2:3.35-2ubuntu2.9 | USN-4417-1 |
| Ubuntu 16.04 LTS | nss | 2:3.28.4-0ubuntu0.16.04.12 | USN-4417-1 |
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+esm6 | USN-4417-2 |
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 |
| 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 |
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 | MozillaFirefox | 78.0.1-3.94.2 | SUSE-SU-2020:1898-1 |
| SLES 15 SP2 | MozillaFirefox-branding-SLE | 78-4.14.1 | SUSE-SU-2020:1898-1 |
| SLES 15 SP2 | mozilla-nss | 3.53.1-3.45.1 | SUSE-SU-2020:1850-1 |
| SLES 15 SP1 | MozillaFirefox | 78.0.1-3.94.2 | SUSE-SU-2020:1898-1 |
| SLES 15 SP1 | MozillaFirefox-branding-SLE | 78-4.14.1 | SUSE-SU-2020:1898-1 |
| SLES 15 SP1 | mozilla-nss | 3.53.1-3.45.1 | SUSE-SU-2020:1850-1 |
| SLES 15 | mozilla-nss | 3.53.1-3.45.1 | SUSE-SU-2020:1850-1 |
| SLES 12 SP5 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES 12 SP4 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES 12 SP3 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-78.80.2 | SUSE-SU-2020:14421-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 78-21.12.1 | SUSE-SU-2020:14421-1 |
| 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-nss | 3.53.1-3.45.1 | SUSE-SU-2020:1850-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES for SAP 12 SP5 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES for SAP 12 SP4 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES for SAP 12 SP3 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SLES for SAP 12 SP2 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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-nss | 3.53.1-3.45.1 | SUSE-SU-2020:1850-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 | MozillaFirefox | 78.0.1-112.3.1 | SUSE-SU-2020:1899-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox-branding-SLE | 78-35.3.1 | SUSE-SU-2020:1899-1 |
| 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 15.2 | MozillaFirefox | 78.0.1-lp152.2.5.1 | openSUSE-SU-2020:0983-1 |
| openSUSE Leap 15.2 | mozilla-nss | 3.53.1-lp152.2.4.1 | openSUSE-SU-2020:0955-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 78.0.1-lp151.2.53.1 | openSUSE-SU-2020:1017-1 |
| openSUSE Leap 15.1 | mozilla-nss | 3.53.1-lp151.2.26.1 | openSUSE-SU-2020:0953-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 78.0-r0 | — |
| Alpine v3.24 | nss | 3.53.1-r0 | — |
| Alpine v3.23 | firefox +1 | 78.0-r0 | — |
| Alpine v3.23 | nss | 3.53.1-r0 | — |
| Alpine v3.22 | firefox +1 | 78.0-r0 | — |
| Alpine v3.22 | nss | 3.53.1-r0 | — |
| Alpine v3.21 | firefox +1 | 78.0-r0 | — |
| Alpine v3.21 | nss | 3.53.1-r0 | — |
| Alpine v3.20 | firefox | 78.0-r0 | — |
| Alpine v3.20 | nss | 3.53.1-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 78.0-r0 | — |
| Alpine v3.19 | nss | 3.53.1-r0 | — |
| Alpine v3.18 | firefox | 78.0-r0 | — |
| Alpine v3.18 | nss | 3.53.1-r0 | — |
| Alpine v3.17 | firefox | 78.0-r0 | — |
| Alpine v3.17 | nss | 3.53.1-r0 | — |
| Alpine v3.16 | firefox | 78.0-r0 | — |
| Alpine v3.16 | nss | 3.53.1-r0 | — |
| Alpine v3.15 | firefox | 78.0-r0 | — |
| Alpine v3.15 | nss | 3.53.1-r0 | — |
| Alpine v3.14 | firefox | 78.0-r0 | — |
| Alpine v3.14 | nss | 3.53.1-r0 | — |
| Alpine v3.13 | firefox | 78.0-r0 | — |
| Alpine v3.13 | nss | 3.53.1-r0 | — |
| Alpine v3.12 | firefox | 78.0-r0 | — |
| Alpine v3.12 | nss | 3.53.1-r0 | — |
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 | 4.25.0-2.el8_2 | ELSA-2020-3280 |
| Oracle Linux 8 | nss +9 | 3.53.1-11.el8_2 | ELSA-2020-3280 |
| 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 26
- 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-2020:3280 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4417-1 nss vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4417-2 nss vulnerability Ubuntu Security Notices (USN) · Apr 22, 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-2388-1 nss - 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
- SUSE-SU-2020:1899-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1017-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14421-1 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
- openSUSE-SU-2020:0955-1 Security update for mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0953-1 Security update for mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1850-1 Security update for mozilla-nss 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
- openSUSE-SU-2020:0983-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1898-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0457 Mozilla Firefox/Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 1, 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-2020-3280 Moderate: nss and nspr security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 4, 2020
References
- https://www.mozilla.org/security/advisories/mfsa2020-24/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1631597
- openSUSE-SU-2020:0953 vendor-advisory
- openSUSE-SU-2020:0955 vendor-advisory
- USN-4417-1 vendor-advisory
- openSUSE-SU-2020:0983 vendor-advisory
- DSA-4726 vendor-advisory
- FEDORA-2020-3ef1937475 vendor-advisory
- openSUSE-SU-2020:1017 vendor-advisory
- GLSA-202007-10 vendor-advisory
- USN-4417-2 vendor-advisory
- FEDORA-2020-16741ac7ff vendor-advisory
- [debian-lts-announce] 20200929 [SECURITY] [DLA 2388-1] nss security update mailing-list