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CVE-2021-38311

7.5 · HIGH

In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service.

Published Aug 9, 2021CWE-835EPSS 0.94%

Overview

CVE-2021-38311 is a high-severity vulnerability. It was published on August 9, 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

In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. When the negotiated options are already disabled, servers still respond to DONT and WONT requests with WONT or DONT commands, which may lead to infinite acknowledgment loops, denial of service, and excessive CPU consumption.

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-os/contiki/issues/2685GitHubgithub.com/contiki-os/contiki/issues/2685

How CyberStrike helps

Frequently asked questions

What is CVE-2021-38311?

CVE-2021-38311 is a high-severity vulnerability. It was published on August 9, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-38311?

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-2021-38311?

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-2021-38311?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-38311 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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