CVE-2020-27222

HIGH 7.5CVE-2020-27222 · Published 03/02/2021 · updated 17/06/2026

In short

CVE-2020-27222 is a HIGH (CVSS 7.5) vulnerability affecting californium (eclipse).
Chance of exploitation in the next 30 days (EPSS): 0.86%, higher than 58.5% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
californium eclipse	`≥ 2.3.0, ≤ 2.6.0`	No fix yet

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.

References

bugs.eclipse.org/bugs/show_bug.cgi · Permissions Required

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