CVE-2018-5733

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-5733

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-5733.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201803-4

OS impact

OS	Version	Status	Fixed in
arch		fixed	`4.4.1-1`
sles		affected
debian	bookworm	fixed	`4.3.5-3.1`
debian	bullseye	fixed	`4.3.5-3.1`
debian	sid	fixed	`4.3.5-3.1`
debian	trixie	fixed	`4.3.5-3.1`

References

Verify integrity in audit chain (admin only). AS-IS.