What is CVE-2021-32771?

CVE-2021-32771 is a vulnerability in the RPL-Classic implementation in Contiki-NG, which can cause a buffer overflow when copying an IPv6 address prefix.

What is the severity of CVE-2021-32771?

The severity of CVE-2021-32771 is high, with a CVSS score of 8.1.

How does CVE-2021-32771 affect Contiki-NG?

CVE-2021-32771 affects Contiki-NG versions up to and excluding 4.8.

Is there a fix available for CVE-2021-32771?

Yes, a fix for CVE-2021-32771 is available in Contiki-NG release v4.8.

What is the Common Weakness Enumeration (CWE) ID for CVE-2021-32771?

CVE-2021-32771 has CWE IDs 119 and 120.

Vulnerability/
CVE-2021-32771

high

8.1

CWE

120 119

4/8/2022

3/8/2024

CVE-2021-32771: Buffer overflow in contiki-ng

First published: Thu Aug 04 2022(Updated: )

Contiki-NG is an open-source, cross-platform operating system for IoT devices. In affected versions it is possible to cause a buffer overflow when copying an IPv6 address prefix in the RPL-Classic implementation in Contiki-NG. In order to trigger the vulnerability, the Contiki-NG system must have joined an RPL DODAG. After that, an attacker can send a DAO packet with a Target option that contains a prefix length larger than 128 bits. The problem was fixed after the release of Contiki-NG 4.7. Users unable to upgrade may apply the patch in Contiki-NG PR #1615.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Contiki-ng Contiki-ng	<4.8

Remedy

https://github.com/contiki-ng/contiki-ng/pull/1615

Remedy

https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20f

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Reference Links

Frequently Asked Questions

What is CVE-2021-32771?
CVE-2021-32771 is a vulnerability in the RPL-Classic implementation in Contiki-NG, which can cause a buffer overflow when copying an IPv6 address prefix.
What is the severity of CVE-2021-32771?
The severity of CVE-2021-32771 is high, with a CVSS score of 8.1.
How does CVE-2021-32771 affect Contiki-NG?
CVE-2021-32771 affects Contiki-NG versions up to and excluding 4.8.
Is there a fix available for CVE-2021-32771?
Yes, a fix for CVE-2021-32771 is available in Contiki-NG release v4.8.
What is the Common Weakness Enumeration (CWE) ID for CVE-2021-32771?
CVE-2021-32771 has CWE IDs 119 and 120.

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vendor/contiki-ng
canonical/contiki-ng contiki-ng

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