What is CVE-2015-4495?

CVE-2015-4495 is a high-severity vulnerability in Mozilla Firefox, classified under Origin Validation Error. CVSS score: 8.8/10. Published 2015-08-08.

How severe is CVE-2015-4495?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2015-4495 known to be exploited?

Yes. CVE-2015-4495 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-25), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.

Vulnerability in Mozilla Firefox

CVE-2015-4495

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.

Published 2015-08-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.686 (99.3th percentile), scored 2026-10-17.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.713 · newest: 0.686 · change: -0.028

Affected products

Mozilla Firefox
Mozilla Firefox OS
Oracle Solaris — versions 11.3
Canonical Ubuntu Linux — versions 12.04, 14.04, 15.04
openSUSE — versions 13.1, 13.2
Red Hat Enterprise Linux Desktop — versions 5.0, 6.0, 7.0
Red Hat Enterprise Linux Eus — versions 6.7, 7.1, 7.2
Red Hat Enterprise Linux Server — versions 5.0, 6.0, 7.0
Red Hat Enterprise Linux Server Aus — versions 7.3, 7.4, 7.6
Red Hat Enterprise Linux Server Tus — versions 7.3, 7.6, 7.7

Weakness classification (CWE)

CWE-346 — Origin Validation Error

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-06-15.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)
lists.opensuse.org/opensuse-security-announce/2015-08/msg00009.html (vendor-advisory, Mailing List, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2015-08/msg00010.html (vendor-advisory, Mailing List, Third Party Advisory)
www.securityfocus.com/bid/76249 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.exploit-db.com/exploits/37772/ (Exploit, VDB Entry, Third Party Advisory, exploit)
rhn.redhat.com/errata/RHSA-2015-1581.html (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/201512-10 (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html (vendor-advisory, Mailing List, Third Party Advisory)
www.ubuntu.com/usn/USN-2707-1 (vendor-advisory, Third Party Advisory)
www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2015-4495?: CVE-2015-4495 is a high-severity vulnerability in Mozilla Firefox, classified under Origin Validation Error. CVSS score: 8.8/10. Published 2015-08-08.
How severe is CVE-2015-4495?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2015-4495 known to be exploited?: Yes. CVE-2015-4495 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-25), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.