High severity7.5NVD Advisory· Published Aug 19, 2021· Updated Jun 17, 2026
CVE-2021-27565
CVE-2021-27565
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- InterNiche/NicheStackdescription
- Range: <=4.0.1
Patches
Vulnerability mechanics
References
4- www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/nvdMitigationThird Party Advisory
- www.kb.cert.org/vuls/id/608209nvdThird Party AdvisoryUS Government Resource
- www.hcc-embedded.comnvdProduct
- www.hcc-embedded.com/about/about-internichenvdProduct
News mentions
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