What is CVE-2021-21410?

CVE-2021-21410 is a vulnerability in Contiki-NG, an open-source operating system for IoT devices, that allows an out-of-bounds read to be triggered by 6LoWPAN packets.

What is the severity of CVE-2021-21410?

The severity of CVE-2021-21410 is critical, with a severity value of 9.1.

How does CVE-2021-21410 affect Contiki-NG?

CVE-2021-21410 affects Contiki-NG versions 4.6 and prior, allowing an out-of-bounds read to be triggered by 6LoWPAN packets.

How can CVE-2021-21410 be exploited?

CVE-2021-21410 can be exploited by sending malicious 6LoWPAN packets to devices running Contiki-NG versions 4.6 and prior.

Is there a fix for CVE-2021-21410?

Yes, a fix for CVE-2021-21410 is available. It is recommended to update Contiki-NG to a version that is not affected by this vulnerability.

Vulnerability/
CVE-2021-21410

critical

9.1

CWE

125

18/6/2021

3/8/2024

CVE-2021-21410: Out-of-bounds read in the 6LoWPAN implementation

First published: Fri Jun 18 2021(Updated: )

Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. Users can apply the patch for this vulnerability out-of-band as a workaround.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Contiki-ng Contiki-ng	<=4.6

Remedy

https://github.com/contiki-ng/contiki-ng/pull/1482

Remedy

https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9

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Frequently Asked Questions

What is CVE-2021-21410?
CVE-2021-21410 is a vulnerability in Contiki-NG, an open-source operating system for IoT devices, that allows an out-of-bounds read to be triggered by 6LoWPAN packets.
What is the severity of CVE-2021-21410?
The severity of CVE-2021-21410 is critical, with a severity value of 9.1.
How does CVE-2021-21410 affect Contiki-NG?
CVE-2021-21410 affects Contiki-NG versions 4.6 and prior, allowing an out-of-bounds read to be triggered by 6LoWPAN packets.
How can CVE-2021-21410 be exploited?
CVE-2021-21410 can be exploited by sending malicious 6LoWPAN packets to devices running Contiki-NG versions 4.6 and prior.
Is there a fix for CVE-2021-21410?
Yes, a fix for CVE-2021-21410 is available. It is recommended to update Contiki-NG to a version that is not affected by this vulnerability.

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vendor/contiki-ng
canonical/contiki-ng contiki-ng
version/contiki-ng contiki-ng/4.6

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