Description
When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead. This results in full malleability of the ClientHello for SSLv2 used for TLS 1.2 in all versions prior to NSS 3.39. This does not impact TLS 1.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NSS | Network Security Services (NSS) | All versions prior to NSS 3.39 | — |
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 | 2:3.39-1 | — |
| Debian 13 | nss | 2:3.39-1 | — |
| Debian 12 | nss | 2:3.39-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | nss | 2:3.35-2ubuntu2.1 | USN-3850-1 |
| Ubuntu 16.04 LTS | nss | 2:3.28.4-0ubuntu0.16.04.4 | USN-3850-1 |
| Ubuntu 14.04 LTS | nss | 2:3.28.4-0ubuntu0.14.04.4 | USN-3850-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | nss +4 | 3.36.0-7.el7_5 | RHSA-2018:2768 |
| RHEL 6 | nss +4 | 3.36.0-9.el6_10 | RHSA-2018:2898 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | MozillaFirefox | 60.4.0-3.21.1 | SUSE-SU-2018:4235-1 |
| SLES 15 | mozilla-nspr | 4.20-3.3.2 | SUSE-SU-2018:4235-1 |
| SLES 15 | mozilla-nss | 3.40.1-3.7.2 | SUSE-SU-2018:4235-1 |
| SLES 12 SP4 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP4 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP4 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP3 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP3 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP3 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP2 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP2 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP2 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP1 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP1 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES 12 SP1 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES 12 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES 12 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP4 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP4 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP3 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP2 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-2 |
| SLES for SAP 12 SP1 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-2 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-2 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SUSE OpenStack Cloud 7 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SUSE OpenStack Cloud 7 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.4.0esr-109.55.1 | SUSE-SU-2018:4236-1 |
| SUSE Enterprise Storage 4 | mozilla-nspr | 4.20-19.6.1 | SUSE-SU-2018:4236-1 |
| SUSE Enterprise Storage 4 | mozilla-nss | 3.40.1-58.18.1 | SUSE-SU-2018:4236-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mozilla-nss | 3.69.1-1.2 | openSUSE-SU-2024:11058-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nss | 3.39-r0 | — |
| Alpine v3.23 | nss | 3.39-r0 | — |
| Alpine v3.22 | nss | 3.39-r0 | — |
| Alpine v3.21 | nss | 3.39-r0 | — |
| Alpine v3.20 | nss | 3.39-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nss | 3.39-r0 | — |
| Alpine v3.18 | nss | 3.39-r0 | — |
| Alpine v3.17 | nss | 3.39-r0 | — |
| Alpine v3.16 | nss | 3.39-r0 | — |
| Alpine v3.15 | nss | 3.39-r0 | — |
| Alpine v3.14 | nss | 3.39-r0 | — |
| Alpine v3.13 | nss | 3.39-r0 | — |
| Alpine v3.12 | nss | 3.39-r0 | — |
| Alpine v3.11 | nss | 3.39-r0 | — |
| Alpine v3.10 | nss | 3.39-r0 | — |
| Alpine v3.9 | nss | 3.39-r0 | — |
| Alpine v3.8 | nss | 3.36.1-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nss +4 | 3.36.0-7.amzn2 | ALAS2-2018-1095 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | nss +4 | 3.36.0-7.el7_5 | ELSA-2018-2768 |
Advisories 10
- RHSA-2018:2898 Red Hat Security Advisory: nss security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2018:2768 Red Hat Security Advisory: nss security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3850-1 nss vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2018:4235-1 Security update for MozillaFirefox, mozilla-nspr and 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-2018:4236-1 Security update for MozillaFirefox, mozilla-nspr and mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:4236-2 Security update for MozillaFirefox, mozilla-nspr and mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1212 Oracle Communications Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 2, 2025
- ALAS2-2018-1095 Moderate: nss security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 25, 2018
- ELSA-2018-2768 Moderate: nss security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 25, 2018