{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-20328",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-20328",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-02-25T16:30:14.536Z",
    "updatedAt": "2024-09-16T19:10:28.653Z",
    "importedAt": "2026-10-24T01:56:26.894Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "MongoDB Java driver client-side field level encryption not verifying KMS host name",
      "summary": "Specific versions of the Java driver that support client-side field level encryption (CSFLE) fail to perform correct host name verification on the KMS server’s certificate. This vulnerability in combination with a privileged network position active MITM attack could result in interception of traffic between the Java driver and the KMS service rendering Field Level Encryption ineffective. This issue was discovered during internal testing and affects all versions of the Java driver that support CSFLE. The Java async, Scala, and reactive streams drivers are not impacted. This vulnerability does not impact driver traffic payloads with CSFLE-supported key services originating from applications residing inside the AWS, GCP, and Azure network fabrics due to compensating controls in these environments. This issue does not impact driver workloads that don’t use Field Level Encryption.",
      "affected": [
        {
          "vendor": "MongoDB Inc.",
          "product": "mongo-java-driver",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3.11",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.11.2"
            },
            {
              "version": "3.12",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.12.7"
            }
          ]
        },
        {
          "vendor": "MongoDB Inc.",
          "product": "mongodb-driver",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3.11",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.11.2"
            },
            {
              "version": "3.12",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.12.7"
            }
          ]
        },
        {
          "vendor": "MongoDB Inc.",
          "product": "mongodb-driver-sync",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4.2.0",
              "status": "affected"
            },
            {
              "version": "3.11",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.11.2"
            },
            {
              "version": "3.12",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.12.7"
            },
            {
              "version": "4.0",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.0.5"
            },
            {
              "version": "4.1",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.1.1"
            }
          ]
        },
        {
          "vendor": "MongoDB Inc.",
          "product": "mongodb-driver-legacy",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4.2.0",
              "status": "affected"
            },
            {
              "version": "3.11",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.11.2"
            },
            {
              "version": "3.12",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.12.7"
            },
            {
              "version": "4.0",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.0.5"
            },
            {
              "version": "4.1",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.1.1"
            }
          ]
        }
      ]
    }
  }
}