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Vulnerability record · CVE-2020-13529 · published 10 May 2021

CVE-2020-13529: Systemd project systemd authentication bypass by spoofing vulnerability

Systemd Project · Systemd

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.

6.1 CVSS 3.1 Medium EPSS 1.4% · top 28.6% CWE-290 · Authentication bypass by spoofing
6.1CVSS 3.1 base score, v2 2.9
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
14References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/08/04/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/17/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/07/3 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOE
https://security.gentoo.org/glsa/202107-48 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210625-0005/ Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1142 ExploitThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/04/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/17/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/07/3 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOE
https://security.gentoo.org/glsa/202107-48 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210625-0005/ Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1142 ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-13529), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.