CVE-2021-34433

7.5 highEPSS 0.3%

High (7.5) in eclipse californium. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
CWEs: CWE-347, CWE-322
Published: 2021-08-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

eclipse:californium

References

https://bugs.eclipse.org/bugs/show_bug.cgi?id=575281
https://bugs.eclipse.org/bugs/show_bug.cgi?id=575281

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