What is the CVSS score of CVE-2013-3660?

CVE-2013-3660 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 69.2%.

Is there a public PoC exploit available for CVE-2013-3660?

Yes, a public proof-of-concept exploit is available for CVE-2013-3660. Prioritise patching immediately. EPSS: 69.2%.

How to fix or mitigate CVE-2013-3660?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Vendor patch is available.

Microsoft CVE-2013-3660

HIGH

Buffer Overflow (CWE-119)

2013-05-24 cve@mitre.org

Buffer Overflow Microsoft

7.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V14 - Configuration Dependency management, component inventory MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation 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	High risk. A reliable public exploit was published quickly, making this accessible to both targeted attackers and commodity malware. The wide range of affected Windows versions (XP through 8) ensured broad applicability.
Exploit ScenarioDerived	Malware uses GDI operations to create complex path objects that trigger the uninitialized pointer condition. By carefully manipulating the kernel heap, the attacker gains arbitrary write primitives in kernel space, overwriting a token to escalate to SYSTEM.

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

Exploited in the wild (CISA KEV) Patch available 69.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 26, 2026

The EPATHOBJ::pprFlattenRec function in Windows win32k.sys fails to properly initialize list pointers, allowing local users to gain SYSTEM privileges through kernel-mode code execution on Windows XP through Windows 8.

Earlier versions of this analysis (1)

v1 Mar 26, 2026 - 11:18 CVSS 7.8

A vulnerability in the EPATHOBJ::pprFlattenRec function in win32k.sys fails to properly initialize a pointer in a linked list structure, enabling local privilege escalation to SYSTEM via a crafted application.

RemediationAI

Apply Microsoft security update MS13-053. Implement kernel exploit mitigations available in Windows 8.1+ (SMEP, CFG).

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

The CWE-119 flaw is in the GDI subsystem's path flattening code. When processing complex path objects, the pprFlattenRec function leaves a next-pointer uninitialized in certain edge cases. An attacker can fill the uninitialized memory with controlled data through heap manipulation, then trigger a write-what-where condition for kernel code execution.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/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

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Oct 22, 2025 - 01:15 cisa

CISA KEV

PoC Detected

Oct 22, 2025 - 01:15 vuln.today

Public exploit code

Patch released

Oct 22, 2025 - 01:15 nvd

Patch available

CVE Published

May 24, 2013 - 20:55 nvd

HIGH 7.8

DescriptionCVE.org

The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, and Windows Server 2012 does not properly initialize a pointer for the next object in a certain list, which allows local users to obtain write access to the PATHRECORD chain, and consequently gain privileges, by triggering excessive consumption of paged memory and then making many FlattenPath function calls, aka "Win32k Read AV Vulnerability."

Executive ViewAI

Why It Matters

CVE-2013-3660 presents notable security risk, a buffer overflow vulnerability rated CVSS 7.8. Exploitation could allow attackers to corrupt memory, crash the application, or potentially execute arbitrary code. This vulnerability is actively exploited in the wild (KEV-listed) and requires immediate remediation. A patch is available and should be applied as part of regular vulnerability management.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

Threat Score

8.6/10

Composite threat intelligence

EPSS Score

69.2%

Top 1% exploitable

Threat Intel

1 sources

Exploit

POC

Public exploit code exists

Data Quality

8 sources

Confidence: High

NVD

CVE.org

CISA KEV

EPSS POC (1) THREAT

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 69.2%

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

Small

Automatable· derived

Human Impact

Very High

Priority Score

203

Low Medium High Critical

KEV: +50

EPSS: +69

CVSS: +39

PoC: +20

Weaponized: +15

Threat intel: +10

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.