Is CVE-2014-1520 being actively exploited?

CVE-2014-1520 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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

CVE-2014-1520 has a CVSS 2.0 base score of 6.9 (MEDIUM).

CVE-2014-1520

MEDIUM · CVSS 6.9EPSS 0.4%EU EUVD

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.

Key facts

CVSS score: 6.9 (v2.0)
Severity: MEDIUM
CVSS vector: AV:L/AC:M/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-269
EPSS score: 0.4% (35th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2014-1596)
Published: April 30, 2014
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2014-1596 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

fedoraproject / fedora
fedoraproject / fedora
microsoft / windows
mozilla / firefox

References

http://lists.fedoraproject.org/pipermail/package-announce/2014-May/132332.html(Third Party Advisory)
http://lists.fedoraproject.org/pipermail/package-announce/2014-May/132437.html(Third Party Advisory)
http://packetstormsecurity.com/files/161696/Mozilla-Arbitrary-Code-Execution-Privilege-Escalation.html(Third Party Advisory, VDB Entry)
http://seclists.org/fulldisclosure/2021/Mar/14(Mailing List, Third Party Advisory)
http://secunia.com/advisories/59866(Third Party Advisory)
http://www.mozilla.org/security/announce/2014/mfsa2014-35.html(Vendor Advisory)
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html(Third Party Advisory)
http://www.securitytracker.com/id/1030163(Third Party Advisory, VDB Entry)
https://bugzilla.mozilla.org/show_bug.cgi?id=961676(Exploit, Issue Tracking, Patch, Vendor Advisory)
https://security.gentoo.org/glsa/201504-01(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain