FKIE_CVE-2021-1821

Vulnerability from fkie_nvd - Published: 2021-10-28 19:15 - Updated: 2026-06-17 03:32
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
A logic issue was addressed with improved state management. This issue is fixed in watchOS 7.6, macOS Big Sur 11.5. Visiting a maliciously crafted webpage may lead to a system denial of service.
References
product-security@apple.comhttps://support.apple.com/en-us/HT212602Vendor Advisory
product-security@apple.comhttps://support.apple.com/en-us/HT212605Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212602Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212605Vendor Advisory
Impacted products
Vendor Product Version
apple macos *
apple watchos *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "macOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "11.5",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "macOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "7.6",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "product-security@apple.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "91CD5E8A-20E3-4193-BD1F-99FB1147081C",
              "versionEndExcluding": "11.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "94EF9266-E8BC-4F20-B724-A3151A06192C",
              "versionEndExcluding": "7.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A logic issue was addressed with improved state management. This issue is fixed in watchOS 7.6, macOS Big Sur 11.5. Visiting a maliciously crafted webpage may lead to a system denial of service."
    },
    {
      "lang": "es",
      "value": "Se abord\u00f3 un problema de l\u00f3gica con una administraci\u00f3n de estado mejorada. Este problema se corrigi\u00f3 en watchOS versi\u00f3n 7.6 y macOS Big Sur versi\u00f3n 11.5. La visita a una p\u00e1gina web maliciosamente dise\u00f1ada puede conllevar a una denegaci\u00f3n de servicio del sistema"
    }
  ],
  "id": "CVE-2021-1821",
  "lastModified": "2026-06-17T03:32:37.223",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.1,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 6.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-10-28T19:15:08.667",
  "references": [
    {
      "source": "product-security@apple.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212602"
    },
    {
      "source": "product-security@apple.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212605"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212602"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212605"
    }
  ],
  "sourceIdentifier": "product-security@apple.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.