CVE-2021-31227

7.5 highEPSS 1.7%

High (7.5) in hcc-embedded nichestack. EPSS 1.7% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

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

EPSS: 1.7% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2021-08-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

hcc-embedded:nichestack

References

https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
https://www.kb.cert.org/vuls/id/608209
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
https://www.kb.cert.org/vuls/id/608209

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