Windows SMB Server Elevation of Privilege Vulnerability_MS:CVE-2026-20921

{
    "lastseen": "2026-01-13T19:38:01",
    "description": "Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.\n",
    "published": "2026-01-13T08:00:00",
    "modified": "2026-01-13T08:00:00",
    "type": "mscve",
    "title": "Windows SMB Server Elevation of Privilege Vulnerability",
    "source": "",
    "references": "",
    "id": "MS:CVE-2026-20921",
    "bulletinFamily": "microsoft",
    "cwe": null,
    "cvelist": [
        "CVE-2026-20921"
    ],
    "sourceData": "",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20921",
    "category_name": "News",
    "post_link": "",
    "product": "",
    "version": "",
    "vendor": "",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}