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CVE-2021-21279

7.5 · HIGH

Contiki-NG is an open-source, cross-platform operating system for internet of things devices.

Published Jun 18, 2021CWE-835EPSS 0.98%

Overview

CVE-2021-21279 is a high-severity vulnerability. It was published on June 18, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, 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 internet of things devices. In verions prior to 4.6, an attacker can perform a denial-of-service attack by triggering an infinite loop in the processing of IPv6 neighbor solicitation (NS) messages. This type of attack can effectively shut down the operation of the system because of the cooperative scheduling used for the main parts of Contiki-NG and its communication stack. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.

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/security/advisories/GHSA-rr5j-j8m8-fc4fGitHubgithub.com/contiki-ng/contiki-ng/security/advisories/GHSA-rr5j-j8m8-fc4f

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21279?

CVE-2021-21279 is a high-severity vulnerability. It was published on June 18, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-21279?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2021-21279?

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-2021-21279?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21279 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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