Description
It was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | nss | 3.21.x | — |
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 | 2:3.25-1 | — |
| Debian 13 | nss | 2:3.25-1 | — |
| Debian 12 | nss | 2:3.25-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | nss | 2:3.26.2-0ubuntu0.16.04.2 | USN-3163-1 |
| Ubuntu 14.04 LTS | nss | 2:3.26.2-0ubuntu0.14.04.3 | USN-3163-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | nss +4 | 3.21.3-2.el7_3 | RHSA-2016:2779 |
| RHEL 7 | nss-util +1 | 3.21.3-1.1.el7_3 | RHSA-2016:2779 |
| RHEL 6 | nss +4 | 3.21.3-2.el6_8 | RHSA-2016:2779 |
| RHEL 6 | nss-util +1 | 3.21.3-1.el6_8 | RHSA-2016:2779 |
| RHEL 5 | nss +3 | 3.21.3-2.el5_11 | RHSA-2016:2779 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP2 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES 12 SP2 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP2 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES 12 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1248-1 |
| SLES 12 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES 12 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES 11 SP4 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SLES 11 SP4 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SLES 11 SP4 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SLES 11 SP3 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SLES 11 SP3 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SLES 11 SP3 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP2 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP2 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SLES for SAP 11 SP4 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SLES for SAP 11 SP4 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE OpenStack Cloud 5 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE OpenStack Cloud 5 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE OpenStack Cloud 5 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager Proxy 2.1 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE Manager Proxy 2.1 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager Proxy 2.1 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager 2.1 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE Manager 2.1 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager 2.1 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | nss +4 | 3.21.3-2.0.1.el7_3 | ELSA-2016-2779 |
| Oracle Linux 7 | nss-util +1 | 3.21.3-1.1.el7_3 | ELSA-2016-2779 |
Advisories 5
- RHSA-2016:2779 Red Hat Security Advisory: nss and nss-util security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3163-1 nss vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2017:1175-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1248-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr, java-1_8_0-openjdk SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2016-2779 Moderate: nss and nss-util security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 16, 2016
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8635
- RHSA-2016:2779 vendor-advisory
- GLSA-201701-46 vendor-advisory
- 94346 vdb-entry