Is CVE-2014-1538 in the CISA KEV catalog?

No. CVE-2014-1538 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-1538?

CVE-2014-1538 has a CVSS v2 base score of 10.0 (HIGH).

What is the EPSS score for CVE-2014-1538?

CVE-2014-1538 has an EPSS score of 4.91% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-1538?

Upgrade firefox on ubuntu 14.04 to 30.0+build1-0ubuntu0.14.04.3 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2014-1538

HIGHEPSS 91th pctl

10.0

CVSS v2

NVD

Description

Use-after-free vulnerability in the nsTextEditRules::CreateMozBR function in Mozilla Firefox before 30.0, Firefox ESR 24.x before 24.6, and Thunderbird before 24.6 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

How to fix

Remediation Available

firefoxUbuntu

Fixed in:30.0+build1-0ubuntu0.14.04.3USN-2243-1

thunderbirdUbuntu

Fixed in:1:24.6.0+build1-0ubuntu0.14.04.1USN-2250-1

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

4.91%probability of exploitation in 30 days

91stpercentile

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

References

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HTML

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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.