Is CVE-2015-4478 in the CISA KEV catalog?

No. CVE-2015-4478 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4478?

CVE-2015-4478 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2015-4478?

CVE-2015-4478 has an EPSS score of 3.37% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4478?

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

CVE & CISA-KEV Catalog

CVE-2015-4478

MEDIUMEPSS 87th pctl

5.0

CVSS v2

NVD

Description

Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 do not impose certain ECMAScript 6 requirements on JavaScript object properties, which allows remote attackers to bypass the Same Origin Policy via the reviver parameter to the JSON.parse method.

CWE-200Information Exposure

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

3.37%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references16

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	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.