# CVE-2015-4495: Mozilla Firefox Security Feature Bypass Vulnerability

> CVE-2015-4495: Mozilla Firefox Security Feature Bypass Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2015-4495
Last updated: 2025-10-21T23:55:58Z

- Published: 2015-08-08 00:00 UTC · Updated: 2025-10-21 23:55 UTC · Assigner: mozilla
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 68.6%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-25, federal due date 2022-06-15, ransomware use: Unknown

## Description

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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Mozilla: Firefox

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2015-4495)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2015-4495)
- [http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00009.html](http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00009.html)
- [http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00010.html](http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00010.html)
- [http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html](http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html)
- [http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html](http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html)
- [http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html](http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html)
- [http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html](http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html)
- [http://rhn.redhat.com/errata/RHSA-2015-1581.html](http://rhn.redhat.com/errata/RHSA-2015-1581.html)
- [https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/](https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=1178058](https://bugzilla.mozilla.org/show_bug.cgi?id=1178058)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=1179262](https://bugzilla.mozilla.org/show_bug.cgi?id=1179262)
- [https://security.gentoo.org/glsa/201512-10](https://security.gentoo.org/glsa/201512-10)
- [https://www.exploit-db.com/exploits/37772/](https://www.exploit-db.com/exploits/37772/)
- [http://www.mozilla.org/security/announce/2015/mfsa2015-78.html](http://www.mozilla.org/security/announce/2015/mfsa2015-78.html)
- [http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html](http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html)
- [http://www.securityfocus.com/bid/76249](http://www.securityfocus.com/bid/76249)
- [http://www.securitytracker.com/id/1033216](http://www.securitytracker.com/id/1033216)
- [http://www.ubuntu.com/usn/USN-2707-1](http://www.ubuntu.com/usn/USN-2707-1)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2015-4495 · Markdown: https://rewindex.com/cve/CVE-2015-4495.md · JSON: https://rewindex.com/api/v1/cves/CVE-2015-4495 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T01:58:49.561Z