Is CVE-2015-4490 in the CISA KEV catalog?

No. CVE-2015-4490 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4490?

CVE-2015-4490 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2015-4490?

CVE-2015-4490 has an EPSS score of 2.95% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4490?

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

CVE & CISA-KEV Catalog

CVE-2015-4490

MEDIUMEPSS 85th pctl

4.3

CVSS v2

NVD

Description

The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem URL schemes during wildcard source-expression matching, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks by leveraging unexpected policy-enforcement behavior.

CWE-79Cross-Site Scripting (XSS)

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

2.95%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory5

Issue Tracking1

bugzilla.mozilla.org

Other references3

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	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.