{
    "id": "CVE-2021-23758",
    "published": "2021-12-03 20:15:07",
    "last_modified": "2026-08-27 04:16:38",
    "cvss_score": "8.1",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-502",
    "description": "All versions of package ajaxpro.2 are vulnerable to Deserialization of Untrusted Data due to the possibility of deserialization of arbitrary .NET classes, which can be abused to gain remote code execution.",
    "epss_score": "0.82578",
    "epss_percentile": "0.99657",
    "kev": 1,
    "kev_due": "2026-09-09",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:28:28",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-09-09."
    },
    "products": [
        {
            "vendor": "ajaxpro.2_project",
            "product": "ajaxpro.2"
        },
        {
            "vendor": "michaelschwarz",
            "product": "ajax.net_professional"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-23758",
        "date_added": "2026-08-26",
        "due_date": "2026-09-09",
        "vendor": "Ajax.NET Professional",
        "product": "Ajax.NET Professional",
        "name": "Ajax.NET Professional Deserialization of Untrusted Data Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html",
        "https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57",
        "https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971",
        "http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html",
        "https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57",
        "https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971",
        "https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758"
    ]
}