GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2021-24032 (GCVE-0-2021-24032)

Vulnerability from cvelistv5 – Published: 2021-03-04 20:15 – Updated: 2024-08-03 19:21
VLAI
Summary
Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output files with default permissions and restricted those permissions immediately afterwards. Output files could therefore momentarily be readable or writable to unintended parties.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-277 - Insecure Inherited Permissions (CWE-277)
Assigner
References
Impacted products
Vendor Product Version CPE status
Facebook Zstandard Unaffected: 1.4.9 , < unspecified (custom)
Affected: 1.4.1 , < unspecified (custom)
Unaffected: unspecified , < 1.4.1 (custom)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T19:21:17.115Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/facebook/zstd/issues/2491"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.facebook.com/security/advisories/cve-2021-24032"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Zstandard",
          "vendor": "Facebook",
          "versions": [
            {
              "lessThan": "unspecified",
              "status": "unaffected",
              "version": "1.4.9",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "affected",
              "version": "1.4.1",
              "versionType": "custom"
            },
            {
              "lessThan": "1.4.1",
              "status": "unaffected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "dateAssigned": "2021-03-01T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output files with default permissions and restricted those permissions immediately afterwards. Output files could therefore momentarily be readable or writable to unintended parties."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-277",
              "description": "Insecure Inherited Permissions (CWE-277)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-03-04T20:15:21.000Z",
        "orgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
        "shortName": "facebook"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/facebook/zstd/issues/2491"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.facebook.com/security/advisories/cve-2021-24032"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve-assign@fb.com",
          "DATE_ASSIGNED": "2021-03-01",
          "ID": "CVE-2021-24032",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Zstandard",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "!\u003e=",
                            "version_value": "1.4.9"
                          },
                          {
                            "version_affected": "\u003e=",
                            "version_value": "1.4.1"
                          },
                          {
                            "version_affected": "!\u003c",
                            "version_value": "1.4.1"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Facebook"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output files with default permissions and restricted those permissions immediately afterwards. Output files could therefore momentarily be readable or writable to unintended parties."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Insecure Inherited Permissions (CWE-277)"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/facebook/zstd/issues/2491",
              "refsource": "MISC",
              "url": "https://github.com/facebook/zstd/issues/2491"
            },
            {
              "name": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519",
              "refsource": "MISC",
              "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519"
            },
            {
              "name": "https://www.facebook.com/security/advisories/cve-2021-24032",
              "refsource": "MISC",
              "url": "https://www.facebook.com/security/advisories/cve-2021-24032"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
    "assignerShortName": "facebook",
    "cveId": "CVE-2021-24032",
    "datePublished": "2021-03-04T20:15:21.000Z",
    "dateReserved": "2021-01-13T00:00:00.000Z",
    "dateUpdated": "2024-08-03T19:21:17.115Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-24032",
      "date": "2026-09-16",
      "epss": "0.00346",
      "percentile": "0.27966"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:facebook:zstandard:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"1.4.1\", \"versionEndExcluding\": \"1.4.9\", \"matchCriteriaId\": \"D09560DA-1F1B-41AA-B96F-DABEE82C04D0\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output files with default permissions and restricted those permissions immediately afterwards. Output files could therefore momentarily be readable or writable to unintended parties.\"}, {\"lang\": \"es\", \"value\": \"A partir de la versi\\u00f3n v1.4.1 y anterior a la v1.4.9, debido a una soluci\\u00f3n incompleta para el CVE-2021-24031, la utilidad de l\\u00ednea de comandos Zstandard cre\\u00f3 archivos de salida con permisos predeterminados y restringi\\u00f3 esos permisos inmediatamente despu\\u00e9s.\u0026#xa0;Por lo tanto, los archivos de salida podr\\u00edan ser moment\\u00e1neamente legibles o escribibles para personas no deseadas\"}]",
      "id": "CVE-2021-24032",
      "lastModified": "2024-11-21T05:52:14.943",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N\", \"baseScore\": 4.7, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 1.0, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:L/AC:M/Au:N/C:P/I:N/A:N\", \"baseScore\": 1.9, \"accessVector\": \"LOCAL\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"LOW\", \"exploitabilityScore\": 3.4, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-03-04T21:15:12.963",
      "references": "[{\"url\": \"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519\", \"source\": \"cve-assign@fb.com\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/facebook/zstd/issues/2491\", \"source\": \"cve-assign@fb.com\", \"tags\": [\"Issue Tracking\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.facebook.com/security/advisories/cve-2021-24032\", \"source\": \"cve-assign@fb.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/facebook/zstd/issues/2491\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Issue Tracking\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.facebook.com/security/advisories/cve-2021-24032\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}]",
      "sourceIdentifier": "cve-assign@fb.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"cve-assign@fb.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-277\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-276\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-24032\",\"sourceIdentifier\":\"cve-assign@fb.com\",\"published\":\"2021-03-04T21:15:12.963\",\"lastModified\":\"2024-11-21T05:52:14.943\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output files with default permissions and restricted those permissions immediately afterwards. Output files could therefore momentarily be readable or writable to unintended parties.\"},{\"lang\":\"es\",\"value\":\"A partir de la versi\u00f3n v1.4.1 y anterior a la v1.4.9, debido a una soluci\u00f3n incompleta para el CVE-2021-24031, la utilidad de l\u00ednea de comandos Zstandard cre\u00f3 archivos de salida con permisos predeterminados y restringi\u00f3 esos permisos inmediatamente despu\u00e9s.\u0026#xa0;Por lo tanto, los archivos de salida podr\u00edan ser moment\u00e1neamente legibles o escribibles para personas no deseadas\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:L/AC:M/Au:N/C:P/I:N/A:N\",\"baseScore\":1.9,\"accessVector\":\"LOCAL\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"LOW\",\"exploitabilityScore\":3.4,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"cve-assign@fb.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-277\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-276\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:facebook:zstandard:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.4.1\",\"versionEndExcluding\":\"1.4.9\",\"matchCriteriaId\":\"D09560DA-1F1B-41AA-B96F-DABEE82C04D0\"}]}]}],\"references\":[{\"url\":\"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519\",\"source\":\"cve-assign@fb.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/facebook/zstd/issues/2491\",\"source\":\"cve-assign@fb.com\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.facebook.com/security/advisories/cve-2021-24032\",\"source\":\"cve-assign@fb.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/facebook/zstd/issues/2491\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.facebook.com/security/advisories/cve-2021-24032\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T13:53:32+00:00",
      "cve": "CVE-2021-24032",
      "id": "CVE-2021-24032",
      "initial_release_date": "2021-02-11T00:00:00+00:00",
      "product_status:fixed": "1",
      "product_status:known_affected": "33",
      "product_status:known_not_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "zstd: Race condition allows attacker to access world-readable destination file",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-24032.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2025-07-31T23:30:10Z",
      "cve": "CVE-2021-24032",
      "id": "CVE-2021-24032",
      "initial_release_date": "2023-02-15T03:45:14Z",
      "product_status:recommended": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-24032",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-24032.json",
      "version": "9"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.