# CVE-2020-27222

## Summary

- **CVE ID:** CVE-2020-27222
- **Severity:** UNKNOWN
- **CVSS Score:** 0.01
- **CWE:** CWE-372
- **Published:** Feb 3, 2021
- **Last Modified:** Mar 14, 2026

## 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.

## Affected Products

- The Eclipse Foundation — Eclipse Californium ([2.3.0, 2.6.0])

## References

- [CNA](https://bugs.eclipse.org/bugs/show_bug.cgi?id=570844)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 45.1

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._