Vulnerability-Lookup

FKIE_CVE-2021-33270

Vulnerability from fkie_nvd - Published: 2021-12-01 22:15 - Updated: 2026-06-17 03:54

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_800462c4 in /formAdvFirewall. This vulnerability is triggered via a crafted POST request.

References

URL	Tags
cve@mitre.org	https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06	Exploit, Third Party Advisory
cve@mitre.org	https://www.dlink.com/en/security-bulletin/	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.dlink.com/en/security-bulletin/	Vendor Advisory

Impacted products

	Vendor	Product	Version
	dlink	dir-809_firmware	*
	dlink	dir-809	-

JSON

To clipboard

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    {
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          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
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      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
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          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:dlink:dir-809_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83964738-E503-43D1-90AB-42C46699702B",
              "versionEndIncluding": "1.12wwb03",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
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    },
    {
      "lang": "es",
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    }
  ],
  "id": "CVE-2021-33270",
  "lastModified": "2026-06-17T03:54:24.473",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 10.0,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2021-12-01T22:15:07.827",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.dlink.com/en/security-bulletin/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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        "Third Party Advisory"
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.dlink.com/en/security-bulletin/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-33270 (GCVE-0-2021-33270)

Vulnerability from cvelistv5 – Published: 2021-12-01 21:20 – Updated: 2024-08-03 23:42

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

2 references

URL	Tags
https://www.dlink.com/en/security-bulletin/	x_refsource_MISC
https://github.com/Lnkvct/IoT-poc/tree/master/D-L…	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2024-08-03T23:42:20.284Z",
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          },
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            "url": "https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06"
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          "url": "https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06"
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      "x_legacyV4Record": {
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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.

Detection rules are retrieved from Rulezet.

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.