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Vulnerability record · CVE-2018-5733 · published 16 January 2019

CVE-2018-5733: Isc dhcp integer overflow vulnerability

Isc · Dhcp

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.

7.5 CVSS 3.1 High EPSS 20% · top 2.6% CWE-190 · Integer overflow
7.5CVSS 3.1 base score, v2 5.0
20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
19References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/103188 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040437 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:0469 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0483 Third Party Advisory
https://kb.isc.org/docs/aa-01567 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html Third Party Advisory
https://usn.ubuntu.com/3586-1/ Third Party Advisory
https://usn.ubuntu.com/3586-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4133 Third Party Advisory
http://www.securityfocus.com/bid/103188 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040437 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:0469 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0483 Third Party Advisory
https://kb.isc.org/docs/aa-01567 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html Third Party Advisory
https://security.netapp.com/advisory/ntap-20250425-0010/
https://usn.ubuntu.com/3586-1/ Third Party Advisory
https://usn.ubuntu.com/3586-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4133 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-5733), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.