High severity7.5NVD Advisory· Published Aug 19, 2021· Updated Jun 17, 2026
CVE-2021-31227
CVE-2021-31227
Description
An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send a malformed HTTP packet with a negative Content-Length, which bypasses the size checks and results in a large heap overflow in the wbs_multidata buffer copy.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- HCC embedded/InterNichedescription
- Range: 4.0.1
Patches
Vulnerability mechanics
References
2- 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
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