CVE-2021-32771

High

Description

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductContiki-ng

PublishedAug 4, 2022

First seenAug 4, 2022

Weakness typeCWE-120CWE-120

How to fix

Update

contiki-ng contiki-ng4.8 or later

Affected products

Product	Affected versions	Fixed in
contiki-ng contiki-ng	v < 4.8	4.8

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