In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS…
Priority LOW 34CWE-372Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 fixed, 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
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.
Why it matters now
EPSS 0.00861 58th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 3 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Eclipse Foundation | Eclipse Californium | [2.3.0, 2.6.0] | — | No fix listed | CNA |
- Eclipse Californium VendorEclipse Foundation Affected [2.3.0, 2.6.0] Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:* | 2.3.0 – 2.6.0 | Vulnerable | Eclipse Foundation |
- cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:* Versions 2.3.0 – 2.6.0 Vulnerable ·Eclipse Foundation
Remediation
Red Hat 2 advisories
- RHSA-2021:3207 Released 2021-08-18 · Red Hat rating ModerateRed Hat Integration Camel Quarkus Tech-Preview 2 security update
- Red Hat Integration Camel Quarkus 2
- RHSA-2021:3205 Released 2021-08-18 · Red Hat rating ModerateRed Hat Integration Camel-K 1.4 release and security update
- Red Hat Integration
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Fuse 7 | Affected | No fix yet |
| Red Hat Integration Camel K 1 | Affected | No fix yet |
| Red Hat Integration Camel Quarkus 1 | Affected | No fix yet |
| Red Hat Integration | Fixed | RHSA-2021:3205 |
| Red Hat Integration Camel Quarkus 2 | Fixed | RHSA-2021:3207 |
Not affected: 1 product
- Red Hat JBoss Fuse 6
Timeline
- 2026-10-02 Threatist record created from CVE-2020-27222
- 2026-10-03 Alias added: GHSA-wfcg-xg9m-fp2f
References
More Eclipse Foundation Californium vulnerabilities
- TI-2022-18742 Californium Failing DTLS handshakes causes Data Loss due to throttling blocking processing of records CVSS 3.1HIGH 8.2
- TI-2022-02378 In Eclipse Californium version 2.0.0 to 2.7.2 and 3.0.0-3.5.0 a DTLS resumption handshake… CVSS 3.1HIGH 7.5
- TI-2021-13467 Improper signature verification in Eclipse Californium CVSS 3.1HIGH 7.5
Sources
- CVE-2020-27222 · CVE Program
- CVE-2020-27222 · NVD
- FIRST EPSS
- GHSA-wfcg-xg9m-fp2f · GitHub Advisory Database · CC BY 4.0
- CVE-2020-27222 · Red Hat security data · CC BY 4.0
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