Is CVE-2014-1520 in the CISA KEV catalog?

No. CVE-2014-1520 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-1520?

CVE-2014-1520 has a CVSS v2 base score of 6.9 (MEDIUM).

What is the EPSS score for CVE-2014-1520?

CVE-2014-1520 has an EPSS score of 0.41% (33th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-1520?

Upgrade DeveloperEdition to 29.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2014-1520

MEDIUM

6.9

CVSS v2

NVD

Description

maintenservice_installer.exe in the Maintenance Service Installer in Mozilla Firefox before 29.0 and Firefox ESR 24.x before 24.5 on Windows allows local users to gain privileges by placing a Trojan horse DLL file into a temporary directory at an unspecified point in the update process.

CWE-269Improper Privilege Management

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:29.0Fixed in:29.0Mozilla

Affected:24.0 24.5Fixed in:24.5Mozilla

Mozilla Firefox (en-US)Windows application

Affected:29.0Fixed in:29.0Mozilla

Affected:24.0 24.5Fixed in:24.5Mozilla

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

0.41%probability of exploitation in 30 days

33rdpercentile

Low risk: more likely to be exploited than 33% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory8

Related Vulnerabilities

Other CWE-269 (Improper Privilege Management) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12635	Critical	9.8	100%	-	Fix
CVE-2022-24637	Critical	9.8	99%	-	Fix
CVE-2017-5689	Critical	9.8	92%	KEV	Fix
CVE-2020-3243	Critical	9.8	88%	-	-
CVE-2024-21888	High	8.8	87%	-	-
CVE-2022-0441	Critical	9.8	85%	-	Fix

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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.