{
    "id": "CVE-2013-3661",
    "published": "2013-05-24 20:55:01",
    "last_modified": "2026-06-16 23:55:35",
    "cvss_score": "4.9",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
    "cwe": "CWE-22",
    "description": "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.",
    "epss_score": "0.03852",
    "epss_percentile": "0.89831",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-04 18:17:10",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "microsoft",
            "product": "windows_7"
        },
        {
            "vendor": "microsoft",
            "product": "windows_8"
        },
        {
            "vendor": "microsoft",
            "product": "windows_rt"
        },
        {
            "vendor": "microsoft",
            "product": "windows_server_2003"
        },
        {
            "vendor": "microsoft",
            "product": "windows_server_2008"
        },
        {
            "vendor": "microsoft",
            "product": "windows_server_2012"
        },
        {
            "vendor": "microsoft",
            "product": "windows_vista"
        },
        {
            "vendor": "microsoft",
            "product": "windows_xp"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "26554",
            "title": "Microsoft Windows - 'EPATHOBJ::pprFlattenRec' Local Privilege Escalation (Metasploit)",
            "date": "2013-07-02",
            "url": "https://www.exploit-db.com/exploits/26554"
        },
        {
            "source": "exploit-db",
            "ref_id": "25912",
            "title": "Microsoft Windows NT/2000/2003/2008/XP/Vista/7/8 - 'EPATHOBJ' Local Ring",
            "date": "2013-06-03",
            "url": "https://www.exploit-db.com/exploits/25912"
        },
        {
            "source": "exploit-db",
            "ref_id": "25611",
            "title": "Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase",
            "date": "2013-05-21",
            "url": "https://www.exploit-db.com/exploits/25611"
        }
    ],
    "refs_list": [
        "http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html",
        "http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html",
        "http://secunia.com/advisories/53435",
        "http://twitter.com/taviso/statuses/335557286657400832",
        "http://www.computerworld.com/s/article/9239477",
        "http://www.exploit-db.com/exploits/25611/",
        "http://www.osvdb.org/93539",
        "http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/",
        "http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw",
        "http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html",
        "http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html",
        "http://secunia.com/advisories/53435",
        "http://twitter.com/taviso/statuses/335557286657400832",
        "http://www.computerworld.com/s/article/9239477",
        "http://www.exploit-db.com/exploits/25611/",
        "http://www.osvdb.org/93539",
        "http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/",
        "http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw"
    ]
}