Is CVE-2021-42146 actively exploited?

No active exploitation of CVE-2021-42146 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-42146 be exploited remotely?

Yes. CVE-2021-42146 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-42146?

CVE-2021-42146 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2021-42146

CWE-755Published: January 24, 2024· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).

NVD Source

Technical Analysis

CVE-2021-42146 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.