CVE-2021-4248 (GCVE-0-2021-4248)

Vulnerability from cvelistv5 – Published: 2022-12-18 00:00 – Updated: 2025-04-15 13:00
VLAI
Title
kapetan dns Request.cs entropy
Summary
A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.
Severity
5.6 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE
  • CWE-330 - Insufficiently Random Values -> CWE-331 Insufficient Entropy -> CWE-332 Insufficient Entropy in PRNG
Assigner
References
Impacted products
Vendor Product Version
kapetan dns Affected: 6.0
Affected: 6.1
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:23:10.594Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/kapetan/dns/pull/88"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/kapetan/dns/releases/tag/v7.0.0"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://vuldb.com/?id.216188"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-4248",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-14T17:02:24.875789Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-15T13:00:18.625Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "dns",
          "vendor": "kapetan",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "status": "affected",
              "version": "6.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-330",
              "description": "CWE-330 Insufficiently Random Values -\u003e CWE-331 Insufficient Entropy -\u003e CWE-332 Insufficient Entropy in PRNG",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-12-18T00:00:00.000Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "url": "https://github.com/kapetan/dns/pull/88"
        },
        {
          "url": "https://github.com/kapetan/dns/releases/tag/v7.0.0"
        },
        {
          "url": "https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6"
        },
        {
          "url": "https://vuldb.com/?id.216188"
        }
      ],
      "title": "kapetan dns Request.cs entropy",
      "x_generator": "vuldb.com"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2021-4248",
    "datePublished": "2022-12-18T00:00:00.000Z",
    "dateReserved": "2022-12-18T00:00:00.000Z",
    "dateUpdated": "2025-04-15T13:00:18.625Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-4248",
      "date": "2026-05-27",
      "epss": "0.006",
      "percentile": "0.69697"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:kapetan_dns_project:kapetan_dns:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"7.0.0\", \"matchCriteriaId\": \"FCE459F0-CC56-42A9-9483-B10DDB456FE3\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.\"}, {\"lang\": \"es\", \"value\": \"Se encontr\\u00f3 una vulnerabilidad en kapetan dns hasta 6.1.0. Ha sido calificada como problem\\u00e1tica. Una funci\\u00f3n desconocida del archivo DNS/Protocol/Request.cs es afectada por este problema. La manipulaci\\u00f3n conduce a una entrop\\u00eda insuficiente en prng. El ataque puede lanzarse de forma remota. La actualizaci\\u00f3n a la versi\\u00f3n 7.0.0 puede solucionar este problema. El nombre del parche es cf7105aa2aae90d6656088fe5a8ee1d5730773b6. Se recomienda actualizar el componente afectado. El identificador de esta vulnerabilidad es VDB-216188.\"}]",
      "id": "CVE-2021-4248",
      "lastModified": "2024-11-21T06:37:13.893",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"cna@vuldb.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L\", \"baseScore\": 5.6, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"LOW\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 3.4}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 5.9}]}",
      "published": "2022-12-18T11:15:09.893",
      "references": "[{\"url\": \"https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6\", \"source\": \"cna@vuldb.com\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/kapetan/dns/pull/88\", \"source\": \"cna@vuldb.com\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/kapetan/dns/releases/tag/v7.0.0\", \"source\": \"cna@vuldb.com\", \"tags\": [\"Release Notes\", \"Third Party Advisory\"]}, {\"url\": \"https://vuldb.com/?id.216188\", \"source\": \"cna@vuldb.com\", \"tags\": [\"Permissions Required\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/kapetan/dns/pull/88\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/kapetan/dns/releases/tag/v7.0.0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Release Notes\", \"Third Party Advisory\"]}, {\"url\": \"https://vuldb.com/?id.216188\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Permissions Required\", \"Third Party Advisory\"]}]",
      "sourceIdentifier": "cna@vuldb.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"cna@vuldb.com\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-330\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-4248\",\"sourceIdentifier\":\"cna@vuldb.com\",\"published\":\"2022-12-18T11:15:09.893\",\"lastModified\":\"2024-11-21T06:37:13.893\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.\"},{\"lang\":\"es\",\"value\":\"Se encontr\u00f3 una vulnerabilidad en kapetan dns hasta 6.1.0. Ha sido calificada como problem\u00e1tica. Una funci\u00f3n desconocida del archivo DNS/Protocol/Request.cs es afectada por este problema. La manipulaci\u00f3n conduce a una entrop\u00eda insuficiente en prng. El ataque puede lanzarse de forma remota. La actualizaci\u00f3n a la versi\u00f3n 7.0.0 puede solucionar este problema. El nombre del parche es cf7105aa2aae90d6656088fe5a8ee1d5730773b6. Se recomienda actualizar el componente afectado. El identificador de esta vulnerabilidad es VDB-216188.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cna@vuldb.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L\",\"baseScore\":5.6,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.2,\"impactScore\":3.4},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"cna@vuldb.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-330\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:kapetan_dns_project:kapetan_dns:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"7.0.0\",\"matchCriteriaId\":\"FCE459F0-CC56-42A9-9483-B10DDB456FE3\"}]}]}],\"references\":[{\"url\":\"https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6\",\"source\":\"cna@vuldb.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/kapetan/dns/pull/88\",\"source\":\"cna@vuldb.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/kapetan/dns/releases/tag/v7.0.0\",\"source\":\"cna@vuldb.com\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://vuldb.com/?id.216188\",\"source\":\"cna@vuldb.com\",\"tags\":[\"Permissions Required\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/kapetan/dns/pull/88\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/kapetan/dns/releases/tag/v7.0.0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://vuldb.com/?id.216188\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Permissions Required\",\"Third Party Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"kapetan dns Request.cs entropy\", \"providerMetadata\": {\"orgId\": \"1af790b2-7ee1-4545-860a-a788eba489b5\", \"shortName\": \"VulDB\", \"dateUpdated\": \"2022-12-18T00:00:00.000Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.\"}], \"affected\": [{\"vendor\": \"kapetan\", \"product\": \"dns\", \"versions\": [{\"version\": \"6.0\", \"status\": \"affected\"}, {\"version\": \"6.1\", \"status\": \"affected\"}]}], \"references\": [{\"url\": \"https://github.com/kapetan/dns/pull/88\"}, {\"url\": \"https://github.com/kapetan/dns/releases/tag/v7.0.0\"}, {\"url\": \"https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6\"}, {\"url\": \"https://vuldb.com/?id.216188\"}], \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"LOW\", \"baseScore\": 5.6, \"baseSeverity\": \"MEDIUM\"}}], \"problemTypes\": [{\"descriptions\": [{\"type\": \"CWE\", \"lang\": \"en\", \"description\": \"CWE-330 Insufficiently Random Values -\u003e CWE-331 Insufficient Entropy -\u003e CWE-332 Insufficient Entropy in PRNG\", \"cweId\": \"CWE-330\"}]}], \"x_generator\": \"vuldb.com\"}, \"adp\": [{\"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T17:23:10.594Z\"}, \"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://github.com/kapetan/dns/pull/88\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://github.com/kapetan/dns/releases/tag/v7.0.0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://vuldb.com/?id.216188\", \"tags\": [\"x_transferred\"]}]}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-4248\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-04-14T17:02:24.875789Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-04-14T17:02:26.438Z\"}}]}",
      "cveMetadata": "{\"state\": \"PUBLISHED\", \"cveId\": \"CVE-2021-4248\", \"assignerOrgId\": \"1af790b2-7ee1-4545-860a-a788eba489b5\", \"assignerShortName\": \"VulDB\", \"dateUpdated\": \"2025-04-15T13:00:18.625Z\", \"dateReserved\": \"2022-12-18T00:00:00.000Z\", \"datePublished\": \"2022-12-18T00:00:00.000Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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.