{
  "id": "CVE-2018-0172",
  "url": "https://spydr.io/cve/CVE-2018-0172",
  "published": "2018-03-28T22:29:01.110Z",
  "modified": "2026-06-17T01:29:59.830Z",
  "score": 8.6,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
  "score_source": "NVD",
  "epss": 0.0782,
  "epss_percentile": 0.9453,
  "exploited": true,
  "kev": {
    "added": "2022-03-03",
    "due": "2022-03-17",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Cisco IOS and IOS XE Software Improper Input Validation Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2018-0172"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "cisco"
  ],
  "products": [
    "Cisco IOS and IOS XE"
  ],
  "cwes": [
    "CWE-20",
    "CWE-787"
  ],
  "description": "A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition. Cisco Bug IDs: CSCvg62730.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 8.6,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/103552",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ]
    },
    {
      "url": "http://www.securitytracker.com/id/1040591",
      "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-dhcpr1",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.tenable.com/security/research/tra-2018-06",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0172",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2018-0172",
  "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."
    }
  ]
}