CVE-2021-3570: Debian Linux

High severity, CVSS 8.8. EPSS: 3% chance of exploitation in the next 30 days.

A flaw was found in the ptp4l program of the linuxptp package. A missing length check when forwarding a PTP message between ports allows a remote attacker to cause an information leak, crash, or potentially remote code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. This flaw affects linuxptp versions before 3.1.1, before 2.0.1, before 1.9.3, before 1.8.1, before 1.7.1, before 1.6.1 and before 1.5.1.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 33 only; version 34 only
• Linuxptp Project Linuxptp: before 1.5.1 (fixed in 1.5.1); from 1.6.0, before 1.6.1 (fixed in 1.6.1); from 1.7.0, before 1.7.1 (fixed in 1.7.1); from 1.8.0, before 1.8.1 (fixed in 1.8.1); from 1.9.0, before 1.9.3 (fixed in 1.9.3); from 2.0.0, before 2.0.1 (fixed in 2.0.1); …
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only
• Red Hat Enterprise Linux Aus: version 8.2 only; version 8.4 only
• Red Hat Enterprise Linux Eus: version 8.1 only; version 8.2 only
• Red Hat Enterprise Linux Tus: version 8.2 only; version 8.4 only

Published 2021-07-09. Last modified 2026-06-17.