Improper signature verification in Eclipse Californium
Priority LOW 33CWE-322Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.
Summary
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.
Why it matters now
EPSS 0.00338 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | 2.0.0 and later; up to 2.6.4; 3.0.0-M1 and later; up to 3.0.0-M3 | — | No fix listed | CNA |
- Eclipse Californium VendorEclipse Foundation Affected 2.0.0 and later; up to 2.6.4; 3.0.0-M1 and later; up to 3.0.0-M3 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:* | 2.0.0 to before 2.6.5 | Vulnerable | Eclipse Foundation |
| cpe:2.3:a:eclipse:californium:3.0.0:m1:*:*:*:*:*:* | 3.0.0 m1 | Vulnerable | Eclipse Foundation |
| cpe:2.3:a:eclipse:californium:3.0.0:m2:*:*:*:*:*:* | 3.0.0 m2 | Vulnerable | Eclipse Foundation |
| cpe:2.3:a:eclipse:californium:3.0.0:m3:*:*:*:*:*:* | 3.0.0 m3 | Vulnerable | Eclipse Foundation |
- cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:* Versions 2.0.0 to before 2.6.5 Vulnerable ·Eclipse Foundation
- cpe:2.3:a:eclipse:californium:3.0.0:m1:*:*:*:*:*:* Versions 3.0.0 m1 Vulnerable ·Eclipse Foundation
- cpe:2.3:a:eclipse:californium:3.0.0:m2:*:*:*:*:*:* Versions 3.0.0 m2 Vulnerable ·Eclipse Foundation
- cpe:2.3:a:eclipse:californium:3.0.0:m3:*:*:*:*:*:* Versions 3.0.0 m3 Vulnerable ·Eclipse Foundation
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34433
- 2026-10-03 Alias added: GHSA-48jg-h3cv-mqvx
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-2020-16548 In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-34433 · CVE Program
- CVE-2021-34433 · NVD
- FIRST EPSS
- GHSA-48jg-h3cv-mqvx · GitHub Advisory Database · CC BY 4.0
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