Description
The ssl_Do1stHandshake function in sslsecur.c in libssl in Mozilla Network Security Services (NSS) before 3.15.4, when the TLS False Start feature is enabled, allows man-in-the-middle attackers to spoof SSL servers by using an arbitrary X.509 certificate during certain handshake traffic.
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 | 2:3.15.4-1 | — |
| Debian 13 | nss | 2:3.15.4-1 | — |
| Debian 12 | nss | 2:3.15.4-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | nspr +1 | 4.10.6-1.el6_5 | RHSA-2014:0917 |
| RHEL 6 | nss +4 | 3.16.1-4.el6_5 | RHSA-2014:0917 |
| RHEL 6 | nss-util +1 | 3.16.1-1.el6_5 | RHSA-2014:0917 |
| RHEL 5 | nss +3 | 3.16.1-2.el5 | RHSA-2014:1246 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mozilla-nss | 3.26.2-1.1 | openSUSE-SU-2024:10451-1 |
Advisories 3
- RHSA-2014:1246 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0917 Red Hat Security Advisory: nss and nspr security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- openSUSE-SU-2024:10451-1 libfreebl3-3.26.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- openSUSE-SU-2014:0212 vendor-advisory
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- https://developer.mozilla.org/docs/NSS/NSS_3.15.4_release_notes
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- 64944 vdb-entry
- 20141205 NEW: VMSA-2014-0012 - VMware vSphere product updates address security vulnerabilities mailing-list
- http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
- mozilla-nss-cve20131740-info-disc(90394) vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1053725
- http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
- 20141205 NEW: VMSA-2014-0012 - VMware vSphere product updates address security vulnerabilities mailing-list
- http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html
- USN-2088-1 vendor-advisory
- openSUSE-SU-2014:0213 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=919877
- https://bugs.gentoo.org/show_bug.cgi?id=498172