{
    "id": "CVE-2023-21529",
    "published": "2023-02-14 20:15:11",
    "last_modified": "2026-08-19 17:18:05",
    "cvss_score": "8.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-502",
    "description": "Microsoft Exchange Server Remote Code Execution Vulnerability",
    "epss_score": "0.59294",
    "epss_percentile": "0.99090",
    "kev": 1,
    "kev_due": "2026-04-27",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:31:08",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-04-27."
    },
    "products": [
        {
            "vendor": "microsoft",
            "product": "exchange_server"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2023-21529",
        "date_added": "2026-04-13",
        "due_date": "2026-04-27",
        "vendor": "Microsoft",
        "product": "Exchange Server",
        "name": "Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability",
        "ransomware": 1
    },
    "exploits": [],
    "refs_list": [
        "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529",
        "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21529",
        "https://www.microsoft.com/en-us/security/blog/2026/04/06/storm-1175-focuses-gaze-on-vulnerable-web-facing-assets-in-high-tempo-medusa-ransomware-operations/"
    ]
}