Vulnerability-Lookup

FKIE_CVE-2021-33600

Vulnerability from fkie_nvd - Published: 2021-09-28 10:15 - Updated: 2026-06-17 03:54

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

A denial-of-service (DoS) vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper. The vulnerability occurs because of an attacker can trigger assertion via malformed HTTP packet to web interface. An unauthenticated attacker could exploit this vulnerability by sending a large username parameter. A successful exploitation could lead to a denial-of-service of the product.

References

URL	Tags
cve-notifications-us@f-secure.com	https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame	Vendor Advisory
cve-notifications-us@f-secure.com	https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600	Vendor Advisory

Impacted products

	Vendor	Product	Version
	f-secure	internet_gatekeeper	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "F-Secure Internet Gatekeeper",
          "vendor": "F-Secure",
          "versions": [
            {
              "status": "affected",
              "version": "5 Series All Version"
            }
          ]
        }
      ],
      "source": "cve-notifications-us@f-secure.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:f-secure:internet_gatekeeper:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "936FB1DB-B0AF-4E46-AFB0-FF10D9A008DD",
              "versionEndIncluding": "5.50.47",
              "versionStartIncluding": "5.10",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A denial-of-service (DoS) vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper. The vulnerability occurs because of an attacker can trigger assertion via malformed HTTP packet to web interface. An unauthenticated attacker could exploit this vulnerability by sending a large username parameter. A successful exploitation could lead to a denial-of-service of the product."
    },
    {
      "lang": "es",
      "value": "Se ha detectado una vulnerabilidad de denegaci\u00f3n de servicio (DoS) en la interfaz de usuario web de F-Secure Internet Gatekeeper. La vulnerabilidad se produce porque un atacante puede desencadenar una aserci\u00f3n por medio de un paquete HTTP malformado a la interfaz web. Un atacante no autenticado podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de un par\u00e1metro de nombre de usuario grande. Una explotaci\u00f3n con \u00e9xito podr\u00eda conllevar a una denegaci\u00f3n de servicio del producto"
    }
  ],
  "id": "CVE-2021-33600",
  "lastModified": "2026-06-17T03:54:51.387",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 2.7,
        "source": "cve-notifications-us@f-secure.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-28T10:15:08.100",
  "references": [
    {
      "source": "cve-notifications-us@f-secure.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame"
    },
    {
      "source": "cve-notifications-us@f-secure.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600"
    }
  ],
  "sourceIdentifier": "cve-notifications-us@f-secure.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-33600 (GCVE-0-2021-33600)

Vulnerability from cvelistv5 – Published: 2021-09-28 09:06 – Updated: 2024-08-03 23:50

Title

Denial of Service Vulnerability in Web Interface of F-Secure Internet Gatekeeper

Summary

Severity

5.4 (Medium)


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

CWE

Denial of Service Vulnerability in Web Interface of F-Secure Internet Gatekeeper

Assigner

F-SecureUS

References

2 references

URL	Tags
https://www.f-secure.com/en/business/programs/vul…	x_refsource_MISC
https://www.f-secure.com/en/business/support-and-…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
F-Secure	F-Secure Internet Gatekeeper	Affected: 5 Series All Version

Show details on NVD website

JSON

To clipboard

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          },
          {
            "tags": [
              "x_refsource_MISC",
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            ],
            "url": "https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "product": "F-Secure Internet Gatekeeper",
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          "versions": [
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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            "userInteraction": "REQUIRED",
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      "problemTypes": [
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      "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.

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.