Description
The SSL implementation in Mozilla Firefox before 3.5.14 and 3.6.x before 3.6.11, Thunderbird before 3.0.9 and 3.1.x before 3.1.5, and SeaMonkey before 2.0.9 does not properly set the minimum key length for Diffie-Hellman Ephemeral (DHE) mode, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via a brute-force attack.
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 | 3.12.8-1 | — |
| Debian 13 | nss | 3.12.8-1 | — |
| Debian 12 | nss | 3.12.8-1 | — |
| Debian 5.0 | nss | 3.12.3.1-0lenny2 | DSA-2123-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | firefox | 3.6.11-2.el5 | RHSA-2010:0782 |
| RHEL 5 | nss +3 | 3.12.8-1.el5 | RHSA-2010:0782 |
| RHEL 5 | xulrunner +1 | 1.9.2.11-2.el5 | RHSA-2010:0782 |
| RHEL 4 | firefox | 3.6.11-2.el4 | RHSA-2010:0782 |
| RHEL 4 | nss +2 | 3.12.8-1.el4 | RHSA-2010:0782 |
| RHEL 4 | seamonkey +5 | 1.0.9-64.el4 | RHSA-2010:0781 |
| RHEL 3 | seamonkey +9 | 1.0.9-0.61.el3 | RHSA-2010:0781 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 6
- RHSA-2010:0782 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2010:0781 Red Hat Security Advisory: seamonkey security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2123-1 nss - cryptographic weaknesses Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media 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-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- RHSA-2010:0782 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=554354
- MDVSA-2010:210 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=583337
- http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox
- https://bugzilla.mozilla.org/show_bug.cgi?id=595300
- RHSA-2010:0781 vendor-advisory
- 42867 third-party-advisory
- MDVSA-2010:211 vendor-advisory
- ADV-2011-0061 vdb-entry
- oval:org.mitre.oval:def:12118 vdb-entry signature
- USN-1007-1 vendor-advisory
- DSA-2123 vendor-advisory
- http://support.avaya.com/css/P8/documents/100114250
- http://www.mozilla.org/security/announce/2010/mfsa2010-72.html
- http://support.avaya.com/css/P8/documents/100120156
- 41839 third-party-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=587234