{
  "id": "CVE-2019-5544",
  "url": "https://spydr.io/cve/CVE-2019-5544",
  "published": "2019-12-06T16:15:11.467Z",
  "modified": "2026-06-17T02:37:52.780Z",
  "score": 9.8,
  "severity": "critical",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "score_source": "NVD",
  "epss": 0.97258,
  "epss_percentile": 0.99896,
  "exploited": true,
  "kev": {
    "added": "2021-11-03",
    "due": "2022-05-03",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Known",
    "name": "VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2019-5544"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "vmware",
    "redhat",
    "openslp",
    "fedoraproject"
  ],
  "products": [
    "ESXi and Horizon DaaS"
  ],
  "cwes": [
    "CWE-787"
  ],
  "description": "OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 9.8,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2019/12/10/2",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2019/12/11/2",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    },
    {
      "url": "http://www.vmware.com/security/advisories/VMSA-2019-0022.html",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2019:4240",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2020:0199",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://security.gentoo.org/glsa/202005-12",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5544",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2019-5544",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}