CVE-2021-34433

HIGH

7.5

CVSS Score

Published: August 20, 2021 at 05:10 PM UTC

Updated: June 17, 2026 at 03:55 AM UTC

1 product affected across 1 vendorCalifornium

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Severity

HIGH7.5

Exploit prediction

EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Californium · Eclipse

95%

v ≥ 2.0.0v ≥ 3.0.0-M1v ≤ 2.6.4v ≤ 3.0.0-M32.0.0 ≤ v < 2.6.52.0.0 3.0.0 m1 3.0.0 m2 3.0.0 m33.0.0-M1

Affected range stops below 2.6.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_CONFIRMIssue TrackingVendor Advisory

Source: [email protected]

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

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-322CWE-347

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