Vulnerability-Lookup

GHSA-FRH6-7CWP-HQH4

Vulnerability from github – Published: 2025-12-09 21:31 – Updated: 2025-12-10 18:30

Details

COMMAX WebViewer ActiveX Control 2.1.4.5 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by providing excessively long string arrays through multiple functions. Attackers can exploit boundary errors in Commax_WebViewer.ocx to cause buffer overflow conditions and potentially gain code execution.

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47719"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-09T21:15:50Z",
    "severity": "HIGH"
  },
  "details": "COMMAX WebViewer ActiveX Control 2.1.4.5 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by providing excessively long string arrays through multiple functions. Attackers can exploit boundary errors in Commax_WebViewer.ocx to cause buffer overflow conditions and potentially gain code execution.",
  "id": "GHSA-frh6-7cwp-hqh4",
  "modified": "2025-12-10T18:30:25Z",
  "published": "2025-12-09T21:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47719"
    },
    {
      "type": "WEB",
      "url": "https://www.commax.com"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/50231"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/cncctrl-dllunregisterserver-f-access-violation"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/commax-webviewer-activex-control-commax-webviewer-ocx-buffer-overflow"
    },
    {
      "type": "WEB",
      "url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5663.php"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2021-47719 (GCVE-0-2021-47719)

Vulnerability from cvelistv5 – Published: 2025-12-09 20:41 – Updated: 2026-04-07 14:05

Title

CNC_Ctrl DllUnregisterServer f5501 Access Violation

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-12 16:45 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6106 records in the last 180 days details

References

4 references

URL	Tags
https://www.exploit-db.com/exploits/50231	exploit
https://www.zeroscience.mk/en/vulnerabilities/ZSL…	third-party-advisory
https://www.commax.com	product
https://www.vulncheck.com/advisories/commax-webvi…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
COMMAX Co., Ltd.	COMMAX WebViewer ActiveX Control	Affected: 2.1.4.5

Date Public

2021-08-27 00:00

Credits

LiquidWorm as Gjoko Krstic of Zero Science Lab

Show details on NVD website

JSON

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47719",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-12T16:45:47.710102Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
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      "credits": [
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        }
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      "datePublic": "2021-08-27T00:00:00.000Z",
      "descriptions": [
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            }
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      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
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            "vulnAvailabilityImpact": "HIGH",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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        },
        {
          "name": "Reference",
          "tags": [
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          ],
          "url": "https://www.commax.com"
        },
        {
          "name": "VulnCheck Advisory: CNC_Ctrl DllUnregisterServer f5501 Access Violation",
          "tags": [
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          ],
          "url": "https://www.vulncheck.com/advisories/commax-webviewer-activex-control-commax-webviewer-ocx-buffer-overflow"
        }
      ],
      "source": {
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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