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.
http://www.securityfocus.com/bid/103188
http://www.securitytracker.com/id/1040437
https://access.redhat.com/errata/RHSA-2018:0469
https://access.redhat.com/errata/RHSA-2018:0483
https://kb.isc.org/docs/aa-01567
https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html
https://usn.ubuntu.com/3586-1/
Source: MITRE
Published: 2019-01-16
Updated: 2020-01-09
Type: CWE-190
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH