{
  "threat_severity" : "Moderate",
  "public_date" : "2018-02-28T00:00:00Z",
  "bugzilla" : {
    "description" : "dhcp: Reference count overflow in dhcpd allows denial of service",
    "id" : "1549961",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1549961"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.9",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-190",
  "details" : [ "A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.", "A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing dhcpd to crash, by sending large amounts of traffic." ],
  "acknowledgement" : "Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges Felix Wilhelm (Google) as the original reporter.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "release_date" : "2018-03-09T00:00:00Z",
    "advisory" : "RHSA-2018:0469",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6",
    "package" : "dhcp-12:4.1.1-53.P1.el6_9.3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2018-03-12T00:00:00Z",
    "advisory" : "RHSA-2018:0483",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "dhcp-12:4.2.5-58.el7_4.3"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Will not fix",
    "package_name" : "dhcp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "dhcp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2018-5733\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-5733\nhttps://kb.isc.org/article/AA-01567" ],
  "name" : "CVE-2018-5733",
  "csaw" : false
}