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CVE-2021-27565

7.5 · HIGH

The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (infinite loop and networking outage) via an unexpected valid HTTP request such as OPTIONS.

Published Aug 19, 2021CWE-835EPSS 2.59%

Overview

CVE-2021-27565 is a high-severity vulnerability. It was published on August 19, 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

The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (infinite loop and networking outage) via an unexpected valid HTTP request such as OPTIONS. This occurs because the HTTP request handler enters a miscoded wbs_loop() debugger hook.

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

Refwww.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Refwww.hcc-embedded.com/Refwww.hcc-embedded.com/about/about-internicheRefwww.kb.cert.org/vuls/id/608209Refwww.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Refwww.hcc-embedded.com/Refwww.hcc-embedded.com/about/about-internicheRefwww.kb.cert.org/vuls/id/608209

How CyberStrike helps

Frequently asked questions

What is CVE-2021-27565?

CVE-2021-27565 is a high-severity vulnerability. It was published on August 19, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-27565?

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-2021-27565?

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-2021-27565?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-27565 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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