CVE-2021-27565

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-835

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Mitigation, Third Party Advisory
https://www.hcc-embedded.com/Product
https://www.hcc-embedded.com/about/about-internicheProduct
https://www.kb.cert.org/vuls/id/608209Third Party Advisory, US Government Resource
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Mitigation, Third Party Advisory
https://www.hcc-embedded.com/Product
https://www.hcc-embedded.com/about/about-internicheProduct
https://www.kb.cert.org/vuls/id/608209Third Party Advisory, US Government Resource

Timeline

Published: Aug 19, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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