{
    "id": "CVE-2021-20038",
    "published": "2021-12-08 10:15:07",
    "last_modified": "2026-06-17 03:33:11",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-121",
    "description": "A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.",
    "epss_score": "0.99912",
    "epss_percentile": "0.99966",
    "kev": 1,
    "kev_due": "2022-02-11",
    "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 2022-02-11."
    },
    "products": [
        {
            "vendor": "sonicwall",
            "product": "sma_200"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_200_firmware"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_210"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_210_firmware"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_400"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_400_firmware"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_410"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_410_firmware"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_500v"
        },
        {
            "vendor": "sonicwall",
            "product": "sma_500v_firmware"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-20038",
        "date_added": "2022-01-28",
        "due_date": "2022-02-11",
        "vendor": "SonicWall",
        "product": "SMA 100 Appliances",
        "name": "SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability",
        "ransomware": 1
    },
    "exploits": [],
    "refs_list": [
        "https://github.com/jbaines-r7/badblood",
        "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026",
        "https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/",
        "https://github.com/jbaines-r7/badblood",
        "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026",
        "https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038"
    ]
}