{
    "id": "CVE-2016-2563",
    "published": "2016-04-07 23:59:07",
    "last_modified": "2026-06-17 00:44:18",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-119",
    "description": "Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size response to an SCP download request.",
    "epss_score": "0.34216",
    "epss_percentile": "0.98357",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:16",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "9bis",
            "product": "kitty"
        },
        {
            "vendor": "simon_tatham",
            "product": "putty"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "39551",
            "title": "Putty pscp 0.66 - Stack Buffer Overwrite",
            "date": "2016-03-10",
            "url": "https://www.exploit-db.com/exploits/39551"
        }
    ],
    "refs_list": [
        "http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html",
        "http://seclists.org/fulldisclosure/2016/Mar/22",
        "http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html",
        "http://www.securityfocus.com/bid/84296",
        "http://www.securitytracker.com/id/1035257",
        "https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563",
        "https://security.gentoo.org/glsa/201606-01",
        "http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html",
        "http://seclists.org/fulldisclosure/2016/Mar/22",
        "http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html",
        "http://www.securityfocus.com/bid/84296",
        "http://www.securitytracker.com/id/1035257",
        "https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563",
        "https://security.gentoo.org/glsa/201606-01"
    ]
}