Is CVE-2014-1559 in the CISA KEV catalog?

No. CVE-2014-1559 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-1559?

CVE-2014-1559 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2014-1559?

CVE-2014-1559 has an EPSS score of 1.71% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-1559?

Upgrade firefox on ubuntu 14.04 to 31.0+build1-0ubuntu0.14.04.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2014-1559

MEDIUMEPSS 75th pctl

4.3

CVSS v2

NVD

Description

Mozilla Firefox before 31.0 and Thunderbird before 31.0 allow remote attackers to cause a denial of service (X.509 certificate parsing outage) via a crafted certificate that does not use UTF-8 character encoding in a required context, a different vulnerability than CVE-2014-1558.

How to fix

Remediation Available

firefoxUbuntu

Fixed in:31.0+build1-0ubuntu0.14.04.1USN-2295-1

thunderbirdUbuntu

Fixed in:1:31.0+build1-0ubuntu0.14.04.1USN-2296-1

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

1.71%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references6

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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 2026-05-06.