HOMEVULNERABILITIESCVE-2021-31226
CRITICAL

CVE-2021-31226

CWE-787Published: August 19, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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 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.

NVD Source

Technical Analysis

CVE-2021-31226 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

hcc-embedded1 product(s)
interniche
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (4)

→
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Mitigation · Third Party Advisory
→
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.kb.cert.org/vuls/id/608209Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2021-31226
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-787
CISA KEVNo
Affected1 vendor(s)
PublishedAug 19, 2021

Related CVEs (CWE-787)

CVE-2012-3957
10.0
CVE-2014-1478
10.0
CVE-2018-10718
10.0
CVE-2012-0751
10.0
CVE-2013-5610
10.0
CVE-2018-6692
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-31226 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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