---
id: CVE-2020-13529
title: An exploitable denial-of-service vulnerability exists in Systemd 245
summary: >-
  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 F…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-290
  - CWE-290
vendor: systemd_project
product: systemd
affected:
  - systemd = 245
  - fedora = 33
  - active_iq_unified_manager
  - cloud_backup
published: '2021-05-10'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:27.337'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-13529'
references:
  - url: 'http://www.openwall.com/lists/oss-security/2021/08/04/2'
    label: talos-cna@cisco.com
  - url: 'http://www.openwall.com/lists/oss-security/2021/08/17/3'
    label: talos-cna@cisco.com
  - url: 'http://www.openwall.com/lists/oss-security/2021/09/07/3'
    label: talos-cna@cisco.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/
    label: talos-cna@cisco.com
  - url: 'https://security.gentoo.org/glsa/202107-48'
    label: talos-cna@cisco.com
  - url: 'https://security.netapp.com/advisory/ntap-20210625-0005/'
    label: talos-cna@cisco.com
  - url: 'https://talosintelligence.com/vulnerability_reports/TALOS-2020-1142'
    label: talos-cna@cisco.com
  - url: 'http://www.openwall.com/lists/oss-security/2021/08/04/2'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2021/08/17/3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2021/09/07/3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202107-48'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20210625-0005/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://talosintelligence.com/vulnerability_reports/TALOS-2020-1142'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.01399
epssPercentile: 0.71761
ingestedAt: '2026-10-14T10:25:41.188Z'
---

## Overview

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.

## Affected

- `systemd = 245`
- `fedora = 33`
- `active_iq_unified_manager`
- `cloud_backup`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.