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

CVE-2021-26099 (GCVE-0-2021-26099)

Vulnerability from cvelistv5 – Published: 2021-07-12 09:56 – Updated: 2024-10-25 13:56
VLAI
Summary
Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext.
Severity
4.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-23 13:58 UTC
CWE
  • Information disclosure
Assigner
References
URL Tags
https://fortiguard.com/advisory/FG-IR-20-244 x_refsource_CONFIRM
Impacted products
Vendor Product Version CPE status
Fortinet Fortinet FortiMail Affected: FortiMail before 7.0.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T20:19:19.582Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://fortiguard.com/advisory/FG-IR-20-244"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-26099",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-23T13:58:40.727512Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-25T13:56:14.639Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Fortinet FortiMail",
          "vendor": "Fortinet",
          "versions": [
            {
              "status": "affected",
              "version": "FortiMail before 7.0.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Information disclosure",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-07-12T09:56:37.000Z",
        "orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
        "shortName": "fortinet"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://fortiguard.com/advisory/FG-IR-20-244"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "psirt@fortinet.com",
          "ID": "CVE-2021-26099",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Fortinet FortiMail",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "FortiMail before 7.0.0"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Fortinet"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "High",
            "attackVector": "Network",
            "availabilityImpact": "None",
            "baseScore": 4.2,
            "baseSeverity": "Medium",
            "confidentialityImpact": "High",
            "integrityImpact": "None",
            "privilegesRequired": "High",
            "scope": "Unchanged",
            "userInteraction": "None",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Information disclosure"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://fortiguard.com/advisory/FG-IR-20-244",
              "refsource": "CONFIRM",
              "url": "https://fortiguard.com/advisory/FG-IR-20-244"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
    "assignerShortName": "fortinet",
    "cveId": "CVE-2021-26099",
    "datePublished": "2021-07-12T09:56:37.000Z",
    "dateReserved": "2021-01-25T00:00:00.000Z",
    "dateUpdated": "2024-10-25T13:56:14.639Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-26099",
      "date": "2026-09-16",
      "epss": "0.00545",
      "percentile": "0.44342"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.0\", \"versionEndExcluding\": \"7.0.0\", \"matchCriteriaId\": \"496F9CE5-591B-494B-9373-FFFC49B95D68\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext.\"}, {\"lang\": \"es\", \"value\": \"Una falta de pasos criptogr\\u00e1ficos en el servicio de Cifrado Identity-Based de FortiMail versiones anteriores a 7.0.0 puede permitir a un atacante que entre en posesi\\u00f3n de las claves maestras cifradas comprometer su confidencialidad al observar algunas propiedades invariables del texto cifrado\"}]",
      "id": "CVE-2021-26099",
      "lastModified": "2024-11-21T05:55:51.920",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"psirt@fortinet.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N\", \"baseScore\": 4.4, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 0.7, \"impactScore\": 3.6}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N\", \"baseScore\": 4.9, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"HIGH\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 1.2, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:S/C:P/I:N/A:N\", \"baseScore\": 4.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"SINGLE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-07-12T10:15:07.687",
      "references": "[{\"url\": \"https://fortiguard.com/advisory/FG-IR-20-244\", \"source\": \"psirt@fortinet.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://fortiguard.com/advisory/FG-IR-20-244\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "psirt@fortinet.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-Other\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-26099\",\"sourceIdentifier\":\"psirt@fortinet.com\",\"published\":\"2021-07-12T10:15:07.687\",\"lastModified\":\"2024-11-21T05:55:51.920\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext.\"},{\"lang\":\"es\",\"value\":\"Una falta de pasos criptogr\u00e1ficos en el servicio de Cifrado Identity-Based de FortiMail versiones anteriores a 7.0.0 puede permitir a un atacante que entre en posesi\u00f3n de las claves maestras cifradas comprometer su confidencialidad al observar algunas propiedades invariables del texto cifrado\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@fortinet.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":4.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":0.7,\"impactScore\":3.6},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":4.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.2,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:S/C:P/I:N/A:N\",\"baseScore\":4.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"SINGLE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0\",\"versionEndExcluding\":\"7.0.0\",\"matchCriteriaId\":\"496F9CE5-591B-494B-9373-FFFC49B95D68\"}]}]}],\"references\":[{\"url\":\"https://fortiguard.com/advisory/FG-IR-20-244\",\"source\":\"psirt@fortinet.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://fortiguard.com/advisory/FG-IR-20-244\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:30:31+00:00",
      "cve": "CVE-2021-26099",
      "id": "CVE-2021-26099",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2021-26099",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-26099.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://fortiguard.com/advisory/FG-IR-20-244\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T20:19:19.582Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-26099\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-23T13:58:40.727512Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-23T13:59:48.768Z\"}}], \"cna\": {\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"Fortinet\", \"product\": \"Fortinet FortiMail\", \"versions\": [{\"status\": \"affected\", \"version\": \"FortiMail before 7.0.0\"}]}], \"references\": [{\"url\": \"https://fortiguard.com/advisory/FG-IR-20-244\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"Information disclosure\"}]}], \"providerMetadata\": {\"orgId\": \"6abe59d8-c742-4dff-8ce8-9b0ca1073da8\", \"shortName\": \"fortinet\", \"dateUpdated\": \"2021-07-12T09:56:37.000Z\"}, \"x_legacyV4Record\": {\"impact\": {\"cvss\": {\"scope\": \"Unchanged\", \"version\": \"3.1\", \"baseScore\": 4.2, \"attackVector\": \"Network\", \"baseSeverity\": \"Medium\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N\", \"integrityImpact\": \"None\", \"userInteraction\": \"None\", \"attackComplexity\": \"High\", \"availabilityImpact\": \"None\", \"privilegesRequired\": \"High\", \"confidentialityImpact\": \"High\"}}, \"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"version_value\": \"FortiMail before 7.0.0\"}]}, \"product_name\": \"Fortinet FortiMail\"}]}, \"vendor_name\": \"Fortinet\"}]}}, \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://fortiguard.com/advisory/FG-IR-20-244\", \"name\": \"https://fortiguard.com/advisory/FG-IR-20-244\", \"refsource\": \"CONFIRM\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"Information disclosure\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-26099\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"psirt@fortinet.com\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-26099\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-10-25T13:56:14.639Z\", \"dateReserved\": \"2021-01-25T00:00:00.000Z\", \"assignerOrgId\": \"6abe59d8-c742-4dff-8ce8-9b0ca1073da8\", \"datePublished\": \"2021-07-12T09:56:37.000Z\", \"assignerShortName\": \"fortinet\"}",
      "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.


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.