CVE-2017-9445: Systemd Project Systemd

High severity, CVSS 7.5. EPSS: 54.8% chance of exploitation in the next 30 days.

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.

Affected products

• Systemd Project Systemd: from 223, up to and including 233

Published 2017-06-28. Last modified 2026-06-17.