CVE-2021-34433

HIGH 7.5CVE-2021-34433 · Published 20/08/2021 · updated 17/06/2026

In short

CVE-2021-34433 is a HIGH (CVSS 7.5) vulnerability affecting californium (eclipse).
Chance of exploitation in the next 30 days (EPSS): 0.34%, higher than 27.3% of all vulnerabilities.
Fix: update to 2.6.5 or later.

Package	Affected versions	Patched versions
californium eclipse	`= 3.0.0≥ 2.0.0, < 2.6.5`	`2.6.5`

Description

In Eclipse Californium version 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3, the certificate based (x509 and RPK) DTLS handshakes accidentally succeeds without verifying the server side's signature on the client side, if that signature is not included in the server's ServerKeyExchange.

References

bugs.eclipse.org/bugs/show_bug.cgi · Issue Tracking

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