CVE-2018-5732: ISC Dhcp

High severity, CVSS 7.5. EPSS: 5.2% chance of exploitation in the next 30 days.

Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0

Affected products

• ISC Dhcp: from 4.1.0, up to and including 4.1.2; from 4.2.0, before 4.2.8 (fixed in 4.2.8); from 4.3.0, before 4.3.6 (fixed in 4.3.6); version 4.1-esv only; version 4.1.2 only; version 4.4.0 only

Published 2019-10-09. Last modified 2026-06-17.