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Fencer Intel
high 7.5

CVE-2020-27222 json

In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS se…

published 5y ago modified 4mo ago also EUVD-2020-19737

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

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.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27222 updated cvss 7.5

californium-core: DTLS - DoS vulnerability for certificate based handshakes

  • Red Hat Fuse 7 californium-core californium-core Red Hat Integration Camel K 1 californium-core californium-core Red Hat Integration Camel Quarkus 1 californium-core californium-core
    affected: no fix available
  • Red Hat Integration
    fixed: vendor fix RHSA-2021:3205
  • Red Hat Integration Camel Quarkus 2
    fixed: vendor fix RHSA-2021:3207
  • Red Hat JBoss Fuse 6 californium-core californium-core
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • The Eclipse Foundation Eclipse Californium

Classification

Weakness
  • CWE-372 Incomplete Internal State Distinction

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.