Is CVE-2015-4492 in the CISA KEV catalog?

No. CVE-2015-4492 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4492?

CVE-2015-4492 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-4492?

CVE-2015-4492 has an EPSS score of 5.05% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4492?

Upgrade firefox on ubuntu 14.04 to 40.0+build4-0ubuntu0.14.04.1 or later.

CVE & CISA-KEV Catalog

CVE-2015-4492

HIGHEPSS 91th pctl

7.5

CVSS v2

NVD

Description

Use-after-free vulnerability in the XMLHttpRequest::Open implementation in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 might allow remote attackers to execute arbitrary code via a SharedWorker object that makes recursive calls to the open method of an XMLHttpRequest object.

How to fix

Remediation Available

firefoxUbuntu

Fixed in:40.0+build4-0ubuntu0.14.04.1USN-2702-1

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

5.05%probability of exploitation in 30 days

91stpercentile

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

References

Vendor Advisory1

mozilla.org

Third-Party Advisory5

Issue Tracking1

bugzilla.mozilla.org

Other references11

Embed a live status badge for CVE-2015-4492

Markdown

[![CVE-2015-4492](https://tridentstack.com/cve/badge/CVE-2015-4492.svg)](https://tridentstack.com/cve/CVE-2015-4492)

HTML

<a href="https://tridentstack.com/cve/CVE-2015-4492"><img src="https://tridentstack.com/cve/badge/CVE-2015-4492.svg" alt="CVE-2015-4492"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.