CVE-2021-3570

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-07-09 · updated 2026-06-17
Weakness: CWE-119

Description

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

How to fix

Upgrade to a fixed version: Linuxptp Project Linuxptp 1.5.1, 1.6.1, 1.7.1, 1.8.1. Check the vendor advisory for mitigations.

References

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