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Vulnerability · Published May 10, 2021 · Assigned by talos

CVE-2020-13529

Medium 6.1

In plain English

A medium-severity authentication bypass by spoofing in Systemd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 73% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.0)6.1Medium
Exploit odds (30 days)1.4%top 26.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8NetworkManager-cloud-setup1:1.32.10-4.el8ALSA-2021:4361
AlmaLinux:8NetworkManager-libnm-devel1:1.32.10-4.el8ALSA-2021:4361
Debian:12systemd249.4-2DEBIAN-CVE-2020-13529
Debian:13systemd249.4-2DEBIAN-CVE-2020-13529
Debian:14systemd249.4-2DEBIAN-CVE-2020-13529
Rocky Linux:8NetworkManager1:1.32.10-4.el8RLSA-2021:4361

Affected products (as reported)

VendorProductVersions
n/a Systemd Canonical Ubuntu 20.04 LTS, Systemd 245

Weakness: CWE-290 · Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

References