What is the CVSS score of CVE-2013-6671?

CVE-2013-6671 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 10.4%.

Is there a public PoC exploit available for CVE-2013-6671?

Yes, a public proof-of-concept exploit is available for CVE-2013-6671. Prioritise patching immediately. EPSS: 10.4%.

Firefox CVE-2013-6671

CRITICAL

Code Injection (CWE-94)

2013-12-11 security@mozilla.org

RCE Code Injection Red Hat Mozilla Canonical Enterprise Linux Desktop Enterprise Linux Eus Enterprise Linux Server Enterprise Linux Server Aus Enterprise Linux Server Tus Enterprise Linux Workstation Fedora Firefox Seamonkey Thunderbird Ubuntu Linux Suse Opensuse Enterprise Linux Server Eus Suse Linux Enterprise Desktop Suse Linux Enterprise Server Suse Linux Enterprise Software Development Kit Fedoraproject

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-94 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Code injection prevention, sandbox exec MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 10.40%.
Exploit ScenarioDerived	A remote attacker could inject and execute arbitrary code within the application by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Emergency Immediate action required. Why: CRITICAL + active threat signals, no patch available.

No patch listed yet 10.4% exploitation probability (EPSS)

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AnalysisAI

The nsGfxScrollFrameInner::IsLTR function in Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 allows remote attackers to execute arbitrary. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 10.4%.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Never evaluate user-controlled input as code. Use sandboxing, disable dangerous functions, apply strict input validation.

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 as Code Injection (CWE-94), which allows attackers to inject and execute arbitrary code within the application. The nsGfxScrollFrameInner::IsLTR function in Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 allows remote attackers to execute arbitrary code via crafted use of JavaScript code for ordered list elements. Affected products include: Mozilla Firefox, Mozilla Seamonkey, Mozilla Thunderbird, Canonical Ubuntu Linux, Redhat Enterprise Linux Desktop. Version information: before 26.0.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/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

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Threat Intelligence Overview

EPSS Score

10.4%

Top 7% exploitable

Exploit

POC

Public exploit code exists

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 Yes

EPSS 10.4%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + active threat signals, no 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

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +10

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.

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:a:mozilla:seamonkey:*:*:*:*:*:*:*:*

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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

cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*

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_eus:6.5:*:*:*:*:*:*:*

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

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

cpe:2.3:o:redhat:enterprise_linux_server_aus:6.5:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_eus:6.5:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_tus:6.5:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*

cpe:2.3:a:suse:suse_linux_enterprise_software_development_kit:11.0:sp3:*:*:*:*:*:*

cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*

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References

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