Is CVE-2020-27222 actively exploited?

No active exploitation of CVE-2020-27222 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-27222 be exploited remotely?

Yes. CVE-2020-27222 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-27222?

CVE-2020-27222 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2020-27222

CWE-372Published: February 3, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.

NVD Source

Technical Analysis

CVE-2020-27222 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 availability disruption (denial of service), with a CVSS base score of 7.5.