Description
Use-after-free vulnerability in the ssl3_HandleECDHServerKeyExchange function in Mozilla Network Security Services (NSS) before 3.21, as used in Mozilla Firefox before 44.0, allows remote attackers to cause a denial of service or possibly have unspecified other impact by making an SSL (1) DHE or (2) ECDHE handshake at a time of high memory consumption.
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 | 2:3.21-1 | — |
| Debian 13 | nss | 2:3.21-1 | — |
| Debian 12 | nss | 2:3.21-1 | — |
| Debian 8 | nss | 2:3.26-1+debu8u1 | DSA-3688-1 |
| Debian 7 | nss | 2:3.14.5-1+deb7u6 | DLA-480-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | thunderbird | 1:38.8.0+build1-0ubuntu0.16.04.1 | USN-2973-1 |
| Ubuntu 14.04 LTS | firefox | 44.0.2+build1-0ubuntu0.14.04.1 | — |
| Ubuntu 14.04 LTS | nss | 2:3.21-0ubuntu0.14.04.1 | — |
| Ubuntu 14.04 LTS | thunderbird | 1:38.8.0+build1-0ubuntu0.14.04.1 | USN-2973-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | nspr +1 | 4.11.0-1.el7_2 | RHSA-2016:0685 |
| RHEL 7 | nss +4 | 3.21.0-9.el7_2 | RHSA-2016:0685 |
| RHEL 7 | nss-softokn +3 | 3.16.2.3-14.2.el7_2 | RHSA-2016:0685 |
| RHEL 7 | nss-util +1 | 3.21.0-2.2.el7_2 | RHSA-2016:0685 |
| RHEL 6 | nspr +1 | 4.11.0-0.1.el6_7 | RHSA-2016:0591 |
| RHEL 6 | nss +6 | 3.21.0-0.3.el6_7 | RHSA-2016:0591 |
| RHEL 5 | nspr +1 | 4.11.0-1.el5_11 | RHSA-2016:0684 |
| RHEL 5 | nss +3 | 3.21.0-6.el5_11 | RHSA-2016:0684 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | MozillaFirefox | 38.7.0esr-63.3 | SUSE-SU-2016:0727-1 |
| SLES 12 SP1 | mozilla-nspr | 4.12-12.1 | SUSE-SU-2016:0727-1 |
| SLES 12 SP1 | mozilla-nss | 3.20.2-40.1 | SUSE-SU-2016:0727-1 |
| SLES 12 | MozillaFirefox | 38.7.0esr-63.3 | SUSE-SU-2016:0727-1 |
| SLES 12 | mozilla-nspr | 4.12-12.1 | SUSE-SU-2016:0727-1 |
| SLES 12 | mozilla-nss | 3.20.2-40.1 | SUSE-SU-2016:0727-1 |
| SLES 11 SP4 | MozillaFirefox | 38.7.0esr-37.3 | SUSE-SU-2016:0777-1 |
| SLES 11 SP4 | mozilla-nspr | 4.12-24.1 | SUSE-SU-2016:0777-1 |
| SLES 11 SP4 | mozilla-nss | 3.20.2-28.1 | SUSE-SU-2016:0777-1 |
| SLES 11 SP3 | MozillaFirefox | 38.7.0esr-37.3 | SUSE-SU-2016:0777-1 |
| SLES 11 SP3 | mozilla-nspr | 4.12-24.1 | SUSE-SU-2016:0777-1 |
| SLES 11 SP3 | mozilla-nss | 3.20.2-28.1 | SUSE-SU-2016:0777-1 |
| SLES 11 SP2 | MozillaFirefox | 38.7.0esr-36.3 | SUSE-SU-2016:0909-1 |
| SLES 11 SP2 | mozilla-nspr | 4.12-19.1 | SUSE-SU-2016:0909-1 |
| SLES 11 SP2 | mozilla-nss | 3.20.2-20.1 | SUSE-SU-2016:0909-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | MozillaFirefox | 38.7.0esr-63.3 | SUSE-SU-2016:0727-1 |
| SLES for SAP 12 SP1 | mozilla-nspr | 4.12-12.1 | SUSE-SU-2016:0727-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.20.2-40.1 | SUSE-SU-2016:0727-1 |
| SLES for SAP 12 | MozillaFirefox | 38.7.0esr-63.3 | SUSE-SU-2016:0727-1 |
| SLES for SAP 12 | mozilla-nspr | 4.12-12.1 | SUSE-SU-2016:0727-1 |
| SLES for SAP 12 | mozilla-nss | 3.20.2-40.1 | SUSE-SU-2016:0727-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 38.7.0esr-37.3 | SUSE-SU-2016:0777-1 |
| SLES for SAP 11 SP4 | mozilla-nspr | 4.12-24.1 | SUSE-SU-2016:0777-1 |
| SLES for SAP 11 SP4 | mozilla-nss | 3.20.2-28.1 | SUSE-SU-2016:0777-1 |
Advisories 9
- RHSA-2016:0684 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0685 Red Hat Security Advisory: nss, nspr, nss-softokn, and nss-util security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0591 Red Hat Security Advisory: nss, nss-util, and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-2973-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-480-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3688-1 nss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:0727-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:0909-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:0777-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://bto.bluecoat.com/security-advisory/sa124
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- DSA-3688 vendor-advisory
- RHSA-2016:0684 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.mozilla.org/security/announce/2016/mfsa2016-15.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- SUSE-SU-2016:0820 vendor-advisory
- RHSA-2016:0685 vendor-advisory
- SUSE-SU-2016:0727 vendor-advisory
- 84275 vdb-entry
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.21_release_notes
- USN-2973-1 vendor-advisory
- RHSA-2016:0591 vendor-advisory
- SUSE-SU-2016:0909 vendor-advisory
- 1035258 vdb-entry
- 91787 vdb-entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1209546
- SUSE-SU-2016:0777 vendor-advisory
- GLSA-201605-06 vendor-advisory