Is CVE-2015-0803 in the CISA KEV catalog?

No. CVE-2015-0803 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-0803?

CVE-2015-0803 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-0803?

CVE-2015-0803 has an EPSS score of 3.70% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-0803?

Upgrade firefox on ubuntu 14.04 to 37.0+build2-0ubuntu0.14.04.1 or later.

CVE & CISA-KEV Catalog

CVE-2015-0803

HIGHEPSS 88th pctl

7.5

CVSS v2

NVD

Description

The HTMLSourceElement::AfterSetAttr function in Mozilla Firefox before 37.0 does not properly constrain the original data type of a casted value during the setting of a SOURCE element's attributes, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via a crafted HTML document.

CWE-264Permissions, Privileges, and Access Controls

How to fix

Remediation Available

firefoxUbuntu

Fixed in:37.0+build2-0ubuntu0.14.04.1USN-2550-1

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

3.70%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references6

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2012-1456	Medium	4.3	100%	-	-
CVE-2012-1459	Medium	4.3	100%	-	Fix
CVE-2012-1446	Medium	4.3	100%	-	-
CVE-2012-1443	Medium	4.3	100%	-	-
CVE-2012-1442	Medium	4.3	99%	-	-
CVE-2012-1457	Medium	4.3	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.