CVE-2021-3570

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.

Published: 2021-07-09 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3570 is rated High Risk (65.7/100): CVSS High severity, with high exploitation likelihood (EPSS 5.42%, 90th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3570

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-03 6.48% 5.42% -1.06%
2 2026-05-31 1.44% 6.48% +5.05%
3 2026-05-30 — 1.44% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3570

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.0 2.0 HIGH
AV:N/AC:L/Au:S/C:P/I:P/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 8.5 [email protected]

Weakness enumeration for CVE-2021-3570

OS Trackers for CVE-2021-3570

vendor priority summary link
debian not yet assigned CVE-2021-3570 not yet assigned priority: Debian including 1 source packages (linuxptp), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-3570
redhat high — https://access.redhat.com/security/cve/CVE-2021-3570
suse high — https://www.suse.com/security/cve/CVE-2021-3570/
ubuntu medium CVE-2021-3570 medium priority: Ubuntu including 1 source packages (linuxptp), 11 status rows across 11 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): not-affected 4, released 4, ignored 2, DNE 1. https://ubuntu.com/security/CVE-2021-3570

Affected software / configurations for CVE-2021-3570

Vendor Product Version Raw CPE
linuxptp_project linuxptp < 1.5.1 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
linuxptp_project linuxptp >= 1.6.0, < 1.6.1 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
linuxptp_project linuxptp >= 1.7.0, < 1.7.1 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
linuxptp_project linuxptp >= 1.8.0, < 1.8.1 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
linuxptp_project linuxptp >= 1.9.0, < 1.9.3 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
linuxptp_project linuxptp >= 2.0.0, < 2.0.1 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
linuxptp_project linuxptp >= 3.0.0, < 3.1.1 cpe:2.3:a:linuxptp_project:linuxptp:*:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux_aus 8.2 cpe:2.3:o:redhat:enterprise_linux_aus:8.2:*:*:*:*:*:*:*
redhat enterprise_linux_aus 8.4 cpe:2.3:o:redhat:enterprise_linux_aus:8.4:*:*:*:*:*:*:*
redhat enterprise_linux_eus 8.1 cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*
redhat enterprise_linux_eus 8.2 cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*
redhat enterprise_linux_tus 8.2 cpe:2.3:o:redhat:enterprise_linux_tus:8.2:*:*:*:*:*:*:*
redhat enterprise_linux_tus 8.4 cpe:2.3:o:redhat:enterprise_linux_tus:8.4:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2021-3570

cvelogic Threat Intelligence