CVE-2018-5733

Published: 1 March 2018

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.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
isc-dhcp Launchpad, Ubuntu, Debian	artful	Released (4.3.5-3ubuntu2.2)
	bionic	Released (4.3.5-3ubuntu5)
	trusty	Released (4.2.4-7ubuntu12.12)
	upstream	Needs triage
	xenial	Released (4.3.3-5ubuntu12.9)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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