{
    "id": "CVE-2009-4171",
    "published": "2009-12-02 19:30:00",
    "last_modified": "2026-06-16 23:13:10",
    "cvss_score": "4.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
    "cwe": "CWE-119",
    "description": "An ActiveX control in YahooBridgeLib.dll for Yahoo! Messenger 9.0.0.2162, and possibly other 9.0 versions, allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by calling the RegisterMe method with a long argument.",
    "epss_score": "0.05087",
    "epss_percentile": "0.92092",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-02 18:17:09",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "yahoo",
            "product": "messenger"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "10092",
            "title": "Yahoo! Messenger 9.0.0.2162 - 'YahooBridgeLib.dll' ActiveX Control Remote Denial of Service",
            "date": "2009-11-12",
            "url": "https://www.exploit-db.com/exploits/10092"
        },
        {
            "source": "exploit-db",
            "ref_id": "33350",
            "title": "Yahoo! Messenger 9 - 'YahooBridgeLib.dll' ActiveX Control Remote Denial of Service",
            "date": "2009-11-12",
            "url": "https://www.exploit-db.com/exploits/33350"
        }
    ],
    "refs_list": [
        "http://www.securityfocus.com/archive/1/507818/100/0/threaded",
        "http://www.securityfocus.com/bid/37007",
        "https://exchange.xforce.ibmcloud.com/vulnerabilities/54263",
        "http://www.securityfocus.com/archive/1/507818/100/0/threaded",
        "http://www.securityfocus.com/bid/37007",
        "https://exchange.xforce.ibmcloud.com/vulnerabilities/54263"
    ]
}