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High severity7.5NVD Advisory· Published Aug 20, 2021· Updated Jun 17, 2026

CVE-2021-34433

CVE-2021-34433

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

6
  • Eclipse/Californium6 versions
    cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:*+ 5 more
    • cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:*range: >=2.0.0,<2.6.5
    • cpe:2.3:a:eclipse:californium:3.0.0:m1:*:*:*:*:*:*
    • cpe:2.3:a:eclipse:californium:3.0.0:m2:*:*:*:*:*:*
    • cpe:2.3:a:eclipse:californium:3.0.0:m3:*:*:*:*:*:*
    • (no CPE)range: 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3
    • (no CPE)range: 2.0.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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