CVE-2014-1491

CVE-2014-1491 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-326.

Key facts

• Severity: Medium (CVSS 2.0 base score 4.3)
• EPSS exploit prediction: 5% (91st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-326
• Affected product: Mozilla Firefox
• Published: 2014-02-06
• Last modified: 2026-06-17

Description

Mozilla Network Security Services (NSS) before 3.15.4, as used in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, SeaMonkey before 2.24, and other products, does not properly restrict public values in Diffie-Hellman key exchanges, which makes it easier for remote attackers to bypass cryptographic protection mechanisms in ticket handling by leveraging use of a certain value.

Frequently asked questions

What is CVE-2014-1491?

Mozilla Network Security Services (NSS) before 3.15.4, as used in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, SeaMonkey before 2.24, and other products, does not properly restrict public values in Diffie-Hellman key exchanges, which makes it easier for remote attackers to bypass cryptographic protection mechanisms in ticket handling by leveraging use of a certain value.

How severe is CVE-2014-1491?

CVE-2014-1491 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2014-1491 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-1491?

CVE-2014-1491 primarily affects Mozilla Firefox. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-1491?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2014-1491 published?

CVE-2014-1491 was published on 2014-02-06 and last updated on 2026-06-17.

References

• http://hg.mozilla.org/projects/nss/rev/12c42006aed8
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
• http://lists.fedoraproject.org/pipermail/package-announce/2014-February/127966.html
• http://lists.fedoraproject.org/pipermail/package-announce/2014-February/129218.html
• http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00004.html
• http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00005.html
• http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00017.html
• http://seclists.org/fulldisclosure/2014/Dec/23
• http://secunia.com/advisories/56858
• http://secunia.com/advisories/56888
• http://secunia.com/advisories/56922
• http://www.debian.org/security/2014/dsa-2858
• http://www.debian.org/security/2014/dsa-2994
• http://www.mozilla.org/security/announce/2014/mfsa2014-12.html
• http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
• http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
• http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
• http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html
• http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
• http://www.securityfocus.com/archive/1/534161/100/0/threaded
• http://www.securityfocus.com/bid/65332
• http://www.securitytracker.com/id/1029717
• http://www.securitytracker.com/id/1029720
• http://www.securitytracker.com/id/1029721
• http://www.ubuntu.com/usn/USN-2102-1
• http://www.ubuntu.com/usn/USN-2102-2
• http://www.ubuntu.com/usn/USN-2119-1
• http://www.vmware.com/security/advisories/VMSA-2014-0012.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=934545

Affected products (23)

• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:vm_server:3.2:*:*:*:*:*:x86:*
• cpe:2.3:o:fedoraproject:fedora:19:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:linux_enterprise_desktop:11:sp3:*:*:*:*:*:*
• cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:*:*:*:*
• cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:*:vmware:*:*
• cpe:2.3:o:suse:linux_enterprise_software_development_kit:11:sp3:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*

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