CVE-2013-3661

Exp

The EPATHOBJ::bFlatten function in win32k.sys 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, Windows Server 2012, and Windows RT does not check whether linked-list traversal is continually accessing the same list member, which allows local users to cause a denial of service (infinite traversal) via vectors that trigger a crafted PATHRECORD chain.

Published: 2013-05-24 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-3661 is rated High Exploit Risk (68.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 4.39%, 90th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.63% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2013-3661

EDB-ID Source Kind Published Link
26554 exploit_db edb 2013-07-02 Exploit-DB ↗
25912 exploit_db edb 2013-06-03 Exploit-DB ↗
25611 exploit_db edb 2013-05-21 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2013-3661

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.76% 4.39% +2.63%
2 2025-12-28 0.90% 1.76% +0.86%
3 2025-12-27 — 0.90% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-3661

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 2.0 MEDIUM
AV:L/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 6.9 [email protected]

Weakness enumeration for CVE-2013-3661

Affected software / configurations for CVE-2013-3661

Vendor Product Version Raw CPE
microsoft windows_7 — cpe:2.3:o:microsoft:windows_7:-:sp1:x64:*:*:*:*:*
microsoft windows_7 — cpe:2.3:o:microsoft:windows_7:-:sp1:x86:*:*:*:*:*
microsoft windows_8 — cpe:2.3:o:microsoft:windows_8:-:-:x64:*:*:*:*:*
microsoft windows_8 — cpe:2.3:o:microsoft:windows_8:-:-:x86:*:*:*:*:*
microsoft windows_rt — cpe:2.3:o:microsoft:windows_rt:-:*:*:*:*:*:*:*
microsoft windows_server_2003 — cpe:2.3:o:microsoft:windows_server_2003:*:sp2:*:*:*:*:*:*
microsoft windows_server_2008 — cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
microsoft windows_server_2008 r2 cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*
microsoft windows_server_2012 — cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoft windows_vista — cpe:2.3:o:microsoft:windows_vista:-:sp2:*:*:*:*:*:*
microsoft windows_xp — cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:*
microsoft windows_xp — cpe:2.3:o:microsoft:windows_xp:-:sp2:x64:*:*:*:*:*

References for CVE-2013-3661

cvelogic Threat Intelligence