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Vulnerability Assessment

Impact

CVSS score of 10.0 (CRITICAL). Attack characteristics: network attack vector, low complexity. EPSS exploitation probability: 2.31%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 2.3% exploitation probability (EPSS)

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AnalysisAI

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a shared worker. Affected products include: Oracle Solaris, Mozilla Firefox, Mozilla Firefox Esr, Novell Suse Linux Enterprise Software Development Kit, Novell Suse Linux Enterprise Desktop. Version information: before 39.0.

Severity by source

NVD PRIMARY 10.0 CRITICAL
AV:N/AC:L/Au:N/C:C/I:C/A:C

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Confidentiality
C
Integrity
C
Availability
C

DescriptionCVE.org

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a shared worker.

Threat Intelligence Overview

EPSS Score
2.3%
Top 15% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

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 CRITICAL
CISA KEV No
Public POC No
EPSS 2.3%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
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
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

52
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +50
PoC: 0
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:o:oracle:solaris:11.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.3.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.5.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.5.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.5.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.6.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.7.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:*:*:*:*:*:*:*
cpe:2.3:o:novell:suse_linux_enterprise_desktop:12.0:*:*:*:*:*:*:*
cpe:2.3:o:novell:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:*
+ 1 more

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References

Advisories & patches
ADVISORY http://www.mozilla.org/security/announce/2015/mfsa2015-65.html ADVISORY https://bugzilla.mozilla.org/show_bug.cgi?id=1166924 REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00033.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00034.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html REF http://rhn.redhat.com/errata/RHSA-2015-1207.html REF http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html REF http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html REF http://www.securityfocus.com/bid/75541 REF http://www.securitytracker.com/id/1032783 REF http://www.securitytracker.com/id/1032784 REF http://www.ubuntu.com/usn/USN-2656-1 REF http://www.ubuntu.com/usn/USN-2656-2 REF https://security.gentoo.org/glsa/201512-10

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