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CVE-2021-32771

8.1 · HIGH

Contiki-NG is an open-source, cross-platform operating system for IoT devices.

Published Aug 4, 2022CWE-120EPSS 1.31%

Overview

CVE-2021-32771 is a high-severity vulnerability. It was published on August 4, 2022 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/contiki-ng/contiki-ng/pull/1615GitHubgithub.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fGitHubgithub.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8GitHubgithub.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6wGitHubgithub.com/contiki-ng/contiki-ng/pull/1615GitHubgithub.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fGitHubgithub.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8GitHubgithub.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6w

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32771?

CVE-2021-32771 is a high-severity vulnerability. It was published on August 4, 2022 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-32771?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-32771?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-32771?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32771 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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