CVE-2014-1491

MEDIUMEPSS 91th pctl

4.3

CVSS v2

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.

CWE-326

How to fix

Remediation Available

nssDebian

Fixed in:2:3.15.4-1CVE-2014-1491

DeveloperEditionWindows application

Affected:24.3Fixed in:24.3Mozilla

Affected:27.0Fixed in:27.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:27.0Fixed in:27.0Mozilla

Affected:24.3Fixed in:24.3Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:24.3.0Fixed in:24.3.0Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.66%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Related Vulnerabilities

Other CWE-326 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0224	High	7.4	95%	-	Fix
CVE-2017-1000486	Critical	9.8	94%	KEV	Fix
CVE-2013-2566	Medium	5.9	84%	-	Fix
CVE-2017-11317	Critical	9.8	83%	KEV	-
CVE-2018-18325	High	7.5	74%	KEV	-
CVE-2018-15811	High	7.5	74%	KEV	-

Common questions

How do I fix CVE-2014-1491?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2014-1491 being actively exploited?

Not that we know of. CVE-2014-1491 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 4.7% is the estimated probability that it will be exploited in the next 30 days. That is higher than 91% of all scored CVEs.

How severe is CVE-2014-1491?

CVE-2014-1491 has a CVSS v2 base score of 4.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2014-1491 affect?

Published advisories record a fix for nss (Debian), DeveloperEdition (Windows application), Mozilla Firefox (en-US) (Windows application), Mozilla Thunderbird (en-US) (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.