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Findings

CVE-2013-3660

Microsoft Win32k Privilege Escalation Vulnerability

Published May 24, 2013 · updated Jun 16, 2026 · microsoft windows 7

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."

Timeline

Detection, updates, and resolution for this record.

  1. May 24, 2013 · Catalog

    Detected

    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

  2. Mar 28, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Apr 18, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

Required action

Apply updates per vendor instructions.

CISA due date Apr 18, 2022

Affected

  • cpe microsoft/windows 7version unspecified
  • cpe microsoft/windows 8version unspecified
  • cpe microsoft/windows rtversion unspecified
  • cpe microsoft/windows server 2003version unspecified
  • cpe microsoft/windows server 2008version unspecified
  • cpe microsoft/windows server 2008r2
  • cpe microsoft/windows server 2012version unspecified
  • cpe microsoft/windows vistaversion unspecified
  • vendor Microsoft Win32kversion unspecified

Sources

  • CISA KEVCVE-2013-3660

    The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft does not properly initialize a pointer for the next object in a certain list, which allows local users to gain privileges.

    cisa.gov
  • CVE.orgCVE-2013-3660

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2013-3660

    30-day exploitation probability 39.3%

    first.org
  • Exploit Database25611

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Exploit Database25912

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Exploit Database26554

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Metasploit Modulesexploit_windows/local/ppr_flatten_rec

    Public module reference (average). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDCVE-2013-3660

    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 poin

    nvd.nist.gov

References