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CVE Record

CVE-2021-31226: An issue was discovered in HCC embedded InterNiche 4.0.1.

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 lack of size validation. This vulnerability requires the attacker to send a crafted HTTP POST request with a URI longer than 50 bytes. This leads to a heap overflow in wbs_post() via an strcpy() call.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-31226 is a heap buffer overflow in HCC embedded InterNiche 4.0.1 HTTP POST handling. A crafted POST request with an overlong URI can corrupt heap memory. Business concern is highest for embedded or OT devices exposing this HTTP service, but the public bundle does not enumerate affected device models.

Executive priority

Prioritize inventory and exposure reduction for embedded and OT web interfaces. No active exploitation is cited, but the vulnerability is remotely triggerable against a network-facing parser and affected products are not fully listed.

Technical view

The flaw is in HTTP POST parsing in wbs_post(). Missing URI size validation allows a URI longer than 50 bytes to reach an strcpy() call, causing heap overflow. The supplied sources do not provide CVSS, CWE, confirmed impact beyond overflow, or a complete affected product list.

Likely exposure

Exposure is likely limited to embedded devices or firmware using HCC embedded InterNiche 4.0.1 with the vulnerable HTTP POST handler reachable. The bundle lists no specific vendors, models, CPEs, or deployment fingerprints.

Exploitation context

The source bundle describes a crafted HTTP POST request trigger, but gives no evidence of active exploitation. CISA KEV status is false. Treat internet- or plant-network-exposed embedded web services as higher priority until inventory confirms absence.

Researcher notes

Evidence is narrow but technically specific: overlong POST URI, heap overflow, wbs_post(), strcpy(). Missing details include exploitability outcome, authentication requirements, patch version, affected OEM devices, and CVSS. Avoid assuming every NicheStack device is affected without vendor confirmation.

Mitigation direction

  • Check HCC, device vendor, and integrator advisories for patched firmware or mitigations.
  • Identify embedded and OT assets using HCC InterNiche or NicheStack components.
  • Restrict access to embedded HTTP services from untrusted networks.
  • Disable unused embedded web interfaces where operationally safe.
  • Prioritize firmware updates for reachable assets confirmed to use InterNiche 4.0.1.

Validation and detection

  • Search firmware bills of materials for HCC InterNiche 4.0.1 or NicheStack references.
  • Inventory devices exposing embedded HTTP services, especially in OT networks.
  • Confirm vendor firmware versions against HCC and device-maker advisories.
  • Review network controls for untrusted access to device HTTP endpoints.
  • Document devices where component status cannot be confirmed.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-31226 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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