{
  "id": "CVE-2018-0156",
  "url": "https://spydr.io/cve/CVE-2018-0156",
  "published": "2018-03-28T22:29:00.467Z",
  "modified": "2026-06-17T01:29:57.570Z",
  "score": 7.5,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "score_source": "NVD",
  "epss": 0.0936,
  "epss_percentile": 0.95276,
  "exploited": true,
  "kev": {
    "added": "2022-03-03",
    "due": "2022-03-17",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2018-0156"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "cisco"
  ],
  "products": [
    "Cisco IOS and IOS XE"
  ],
  "cwes": [
    "CWE-399",
    "CWE-20"
  ],
  "description": "A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786. Only Smart Install client switches are affected. Cisco devices that are configured as a Smart Install director are not affected by this vulnerability. Cisco Bug IDs: CSCvd40673.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 7.5,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/103569",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ]
    },
    {
      "url": "http://www.securitytracker.com/id/1040596",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ]
    },
    {
      "url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ]
    },
    {
      "url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ]
    },
    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0156",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2018-0156",
  "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."
    }
  ]
}