Is CVE-2015-4495 being actively exploited?

Yes. CVE-2015-4495 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on May 25, 2022.

What is the CVSS score for CVE-2015-4495?

CVE-2015-4495 has a CVSS 3.1 base score of 8.8 (HIGH).

CVE-2015-4495

HIGH · CVSS 8.8CISA KEV: actively exploitedEPSS 68.6%EU EUVD: exploited

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass the Same Origin Policy, and read arbitrary files or gain privileges, via vectors involving crafted JavaScript code and a native setter, as exploited in the wild in August 2015.

Key facts

CVSS score: 8.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-346
EPSS score: 68.6% (99th percentile)
In CISA KEV: Yes, added May 25, 2022
In EU EUVD: Yes (EUVD-2015-4515)
Published: August 8, 2015
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Mozilla Firefox Security Feature Bypass Vulnerability

Added to the KEV catalog on May 25, 2022; federal remediation due June 15, 2022.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2015-4515 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 21, 2025.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
mozilla / firefox
mozilla / firefox
mozilla / firefox os
opensuse / opensuse
opensuse / opensuse
oracle / solaris
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux workstation
redhat / enterprise linux workstation
redhat / enterprise linux workstation
suse / linux enterprise debuginfo
suse / linux enterprise debuginfo
suse / linux enterprise debuginfo
suse / linux enterprise debuginfo
suse / linux enterprise desktop
suse / linux enterprise desktop
suse / linux enterprise desktop
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise software development kit
suse / linux enterprise software development kit
suse / linux enterprise software development kit

Certified products that may be affected

5 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 7.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11039-2020 - archived
SUSE Linux Enterprise Server Version 12 - SUSE LLC - Common Criteria BSI-DSZ-CC-0962-2016 - archived
SUSE Linux Enterprise Server 11 Service Pack 2 on IBM System z - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0852-2013 - archived
SUSE Linux Enterprise Server 11 Service Pack 2 including KVM virtualization - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0787-2013 - archived
Red Hat Enterprise Linux 5 OpenSSH-Server Cryptographic Module - Red Hat®, Inc. - FIPS 140 1384 - historical

References

http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00009.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00010.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html(Mailing List, Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2015-1581.html(Third Party Advisory)
http://www.mozilla.org/security/announce/2015/mfsa2015-78.html(Vendor Advisory)
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html(Patch, Third Party Advisory)
http://www.securityfocus.com/bid/76249(Broken Link, Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1033216(Broken Link, Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/USN-2707-1(Third Party Advisory)
https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/(Issue Tracking, Vendor Advisory)
https://bugzilla.mozilla.org/show_bug.cgi?id=1178058(Issue Tracking)
https://bugzilla.mozilla.org/show_bug.cgi?id=1179262(Issue Tracking)
https://security.gentoo.org/glsa/201512-10(Third Party Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-4495(US Government Resource)
https://www.exploit-db.com/exploits/37772/(Exploit, Third Party Advisory, VDB Entry)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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