Is CVE-2015-4518 in the CISA KEV catalog?

No. CVE-2015-4518 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4518?

CVE-2015-4518 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2015-4518?

CVE-2015-4518 has an EPSS score of 2.28% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4518?

Upgrade firefox on ubuntu 14.04 to 42.0+build2-0ubuntu0.14.04.1 or later.

CVE & CISA-KEV Catalog

CVE-2015-4518

MEDIUMEPSS 81th pctl

4.3

CVSS v2

NVD

Description

The Reader View implementation in Mozilla Firefox before 42.0 has an improper whitelist, which makes it easier for remote attackers to bypass the Content Security Policy (CSP) protection mechanism and conduct cross-site scripting (XSS) attacks via vectors involving SVG animations and the about:reader URL.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

firefoxUbuntu

Fixed in:42.0+build2-0ubuntu0.14.04.1USN-2785-1

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

2.28%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references7

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.