CVE-2020-13529

Publication date 10 May 2021

Last updated 18 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An exploitable denial-of-service vulnerability exists in Systemd 245. A specially crafted DHCP FORCERENEW packet can cause a server running the DHCP client to be vulnerable to a DHCP ACK spoofing attack. An attacker can forge a pair of FORCERENEW and DCHP ACK packets to reconfigure the server.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
systemd	25.10 questing	Fixed 248.3-1ubuntu3
	25.04 plucky	Fixed 248.3-1ubuntu3
	24.10 oracular	Fixed 248.3-1ubuntu3
	24.04 LTS noble	Fixed 248.3-1ubuntu3
	23.10 mantic	Fixed 248.3-1ubuntu3
	23.04 lunar	Fixed 248.3-1ubuntu3
	22.10 kinetic	Fixed 248.3-1ubuntu3
	22.04 LTS jammy	Fixed 248.3-1ubuntu3
	21.10 impish	Fixed 248.3-1ubuntu3
	21.04 hirsute	Fixed 247.3-3ubuntu3.4
	20.10 groovy	Fixed 246.6-1ubuntu1.7
	20.04 LTS focal	Fixed 245.4-4ubuntu3.10
	18.04 LTS bionic	Fixed 237-3ubuntu10.49
	16.04 LTS xenial	Fixed 229-4ubuntu21.31+esm1
	14.04 LTS trusty	Vulnerable

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Notes

mdeslaur

FORCERENEW was temporarily disabled until proper support for RFC6704 is in place

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
systemd	Upstream: https://github.com/systemd/systemd/pull/20002 Upstream: 38e980a

Severity score breakdown

Parameter	Value
Base score	6.1 · Medium
Attack vector	Adjacent
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H