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

CVE-2015-4495 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 71.6%.

Is there a public PoC exploit available for CVE-2015-4495?

Yes, a public proof-of-concept exploit is available for CVE-2015-4495. Prioritise patching immediately. EPSS: 71.6%.

Is there a patch available for CVE-2015-4495?

Yes, a patch is available for CVE-2015-4495. Update the affected software to the latest version immediately.

Firefox Os CVE-2015-4495

HIGH

Origin Validation Error (CWE-346)

2015-08-08 security@mozilla.org

RCE Oracle Red Hat Mozilla Canonical Enterprise Linux Desktop Enterprise Linux Eus Enterprise Linux Server Enterprise Linux Server Aus Enterprise Linux Server Tus Enterprise Linux Workstation Linux Enterprise Desktop Linux Enterprise Server Linux Enterprise Software Development Kit Solaris Ubuntu Linux Suse Linux Enterprise Debuginfo Opensuse Firefox Os

8.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-346 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Origin validation
Impact	CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. CISA has confirmed active exploitation in the wild. Public proof-of-concept exploit code is available. EPSS exploitation probability: 71.57%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

Act Now Prioritize within 24-48h. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 71.6% exploitation probability (EPSS)

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AnalysisAI

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. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-346. 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. Affected products include: Mozilla Firefox, Mozilla Firefox Os, Oracle Solaris, Canonical Ubuntu Linux, Redhat Enterprise Linux Desktop. Version information: before 39.0.3.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Apr 21, 2026 - 15:31 CISA

CVE Published

Aug 08, 2015 - 00:59 cve.org

HIGH 8.8

DescriptionCVE.org

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.

Threat Intelligence Overview

Threat Score

6.9/10

Composite threat intelligence

EPSS Score

71.6%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

NVD

CVE.org

CISA KEV

EPSS POC (1)

Exploit-DB

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC Yes

EPSS 71.6%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

High

Priority Score

186

Low Medium High Critical

KEV: +50

EPSS: +72

CVSS: +44

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)CVE.org

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

cpe:2.3:o:mozilla:firefox_os:*:*:*:*:*:*:*:*

cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:6.7:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.1:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*

+ 29 more

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References

Advisories & patches

PATCH http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html ADVISORY http://www.mozilla.org/security/announce/2015/mfsa2015-78.html ADVISORY https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/ ADVISORY https://vuldb.com/vuln/76945 REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00009.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00010.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html REF http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html REF http://rhn.redhat.com/errata/RHSA-2015-1581.html REF http://www.securityfocus.com/bid/76249 REF http://www.securitytracker.com/id/1033216 REF http://www.ubuntu.com/usn/USN-2707-1 REF https://bugzilla.mozilla.org/show_bug.cgi?id=1178058 REF https://bugzilla.mozilla.org/show_bug.cgi?id=1179262 REF https://security.gentoo.org/glsa/201512-10 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-4495

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