Is CVE-2015-2743 in the CISA KEV catalog?

No. CVE-2015-2743 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-2743?

CVE-2015-2743 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-2743?

CVE-2015-2743 has an EPSS score of 4.93% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-2743?

Upgrade firefox on ubuntu 14.04 to 39.0+build5-0ubuntu0.14.04.1 or later.

CVE & CISA-KEV Catalog

CVE-2015-2743

HIGHEPSS 91th pctl

7.5

CVSS v2

NVD

Description

PDF.js in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 enables excessive privileges for internal Workers, which might allow remote attackers to execute arbitrary code by leveraging a Same Origin Policy bypass.

CWE-17

How to fix

Remediation Available

firefoxUbuntu

Fixed in:39.0+build5-0ubuntu0.14.04.1USN-2656-1

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

4.93%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 Advisory4

Issue Tracking1

bugzilla.mozilla.org

Other references10

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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.