{
    "id": "CVE-2017-6542",
    "published": "2017-03-27 17:59:00",
    "last_modified": "2026-06-17 01:22:32",
    "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": "The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol message and leveraging the ability to connect to the Unix-domain socket representing the forwarded agent connection, which trigger a buffer overflow.",
    "epss_score": "0.21816",
    "epss_percentile": "0.97567",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:19",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "opensuse",
            "product": "leap"
        },
        {
            "vendor": "opensuse_project",
            "product": "leap"
        },
        {
            "vendor": "putty",
            "product": "putty"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "42137",
            "title": "PuTTY < 0.68 - 'ssh_agent_channel_data' Integer Overflow Heap Corruption",
            "date": "2017-06-07",
            "url": "https://www.exploit-db.com/exploits/42137"
        }
    ],
    "refs_list": [
        "http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html",
        "http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html",
        "http://www.securityfocus.com/bid/97156",
        "http://www.securitytracker.com/id/1038067",
        "https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8",
        "https://security.gentoo.org/glsa/201703-03",
        "https://security.gentoo.org/glsa/201706-09",
        "https://www.exploit-db.com/exploits/42137/",
        "http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html",
        "http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html",
        "http://www.securityfocus.com/bid/97156",
        "http://www.securitytracker.com/id/1038067",
        "https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8",
        "https://security.gentoo.org/glsa/201703-03",
        "https://security.gentoo.org/glsa/201706-09",
        "https://www.exploit-db.com/exploits/42137/"
    ]
}