FKIE_CVE-2021-30738

Vulnerability from fkie_nvd - Published: 2021-09-08 14:15 - Updated: 2026-06-17 03:50
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Summary
A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.
References
product-security@apple.comhttps://support.apple.com/en-us/HT212529Vendor Advisory
product-security@apple.comhttps://support.apple.com/en-us/HT212531Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212529Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212531Vendor Advisory
Impacted products
Vendor Product Version
apple mac_os_x *
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple mac_os_x 10.14.6
apple macos *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "macOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "11.4",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "macOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "2021",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "product-security@apple.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "3C046525-B3B6-4180-B002-AF4E31C1D6FA",
              "versionEndIncluding": "10.14.5",
              "versionStartIncluding": "10.14.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:apple:mac_os_x:10.14.6:-:*:*:*:*:*:*",
              "matchCriteriaId": "693E7DAE-BBF0-4D48-9F8A-20DDBD4AAC0C",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "CFE26ECC-A2C2-4501-9950-510DE0E1BD86",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "26108BEF-0847-4AB0-BD98-35344DFA7835",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "A369D48B-6A0A-47AE-9513-D5E2E6F30931",
              "vulnerable": true
            },
            {
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              "vulnerable": true
            },
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              "vulnerable": true
            },
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              "vulnerable": true
            },
            {
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              "matchCriteriaId": "0FD3467D-7679-479F-9C0B-A93F7CD0929D",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "D4C6098E-EDBD-4A85-8282-B2E9D9333872",
              "vulnerable": true
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              "vulnerable": true
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              "vulnerable": true
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              "vulnerable": true
            },
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              "vulnerable": true
            },
            {
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              "matchCriteriaId": "A4A6BF78-B772-435C-AC1A-2199027CCF9E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:apple:mac_os_x:10.14.6:security_update_2021-003:*:*:*:*:*:*",
              "matchCriteriaId": "9A233DE4-D09A-4157-B852-E675889DD4C1",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "2C88BD98-46F5-447F-963A-FB9B167E31BE",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "C7A0615B-D958-4BBF-B53F-AA839A0FE845",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "391D9971-3C67-4B94-9AF2-1D4D23DAF95F",
              "versionEndExcluding": "11.4",
              "versionStartIncluding": "11.0.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization."
    },
    {
      "lang": "es",
      "value": "Una aplicaci\u00f3n maliciosa puede ser capaz de sobrescribir archivos arbitrarios. Este problema se corrigi\u00f3 en macOS Big Sur versi\u00f3n 11.4, Security Update 2021-004 Mojave. Se abord\u00f3 un problema con la l\u00f3gica de comprobaci\u00f3n de la ruta para los enlaces duros mediante un saneamiento de ruta mejorada"
    }
  ],
  "id": "CVE-2021-30738",
  "lastModified": "2026-06-17T03:50:47.463",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.1,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-08T14:15:09.380",
  "references": [
    {
      "source": "product-security@apple.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212529"
    },
    {
      "source": "product-security@apple.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212531"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212529"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.apple.com/en-us/HT212531"
    }
  ],
  "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.


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