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

CVE-2026-84391 (GCVE-0-2026-84391)

Vulnerability from cvelistv5 – Published: 2026-09-08 16:41 – Updated: 2026-09-08 17:29
VLAI
Summary
A use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via <insert attack vector here>
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 17:29 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Fortinet FortiAnalyzer Affected: 7.6.3 , ≤ 7.6.6 (semver)
    cpe:2.3:o:fortinet:fortianalyzer:7.6.6:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortianalyzer:7.6.5:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortianalyzer:7.6.4:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortianalyzer:7.6.3:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-84391",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T17:29:24.379449Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T17:29:43.459Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:o:fortinet:fortianalyzer:7.6.6:*:*:*:*:*:*:*",
            "cpe:2.3:o:fortinet:fortianalyzer:7.6.5:*:*:*:*:*:*:*",
            "cpe:2.3:o:fortinet:fortianalyzer:7.6.4:*:*:*:*:*:*:*",
            "cpe:2.3:o:fortinet:fortianalyzer:7.6.3:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "product": "FortiAnalyzer",
          "vendor": "Fortinet",
          "versions": [
            {
              "lessThanOrEqual": "7.6.6",
              "status": "affected",
              "version": "7.6.3",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via \u003cinsert attack vector here\u003e"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-457",
              "description": "Denial of service",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-08T16:41:50.685Z",
        "orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
        "shortName": "fortinet"
      },
      "references": [
        {
          "name": "https://fortiguard.fortinet.com/psirt/FG-IR-26-172",
          "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-172"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to FortiAnalyzer version 8.0.0 or above\nUpgrade to FortiAnalyzer version 7.6.7 or above"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
    "assignerShortName": "fortinet",
    "cveId": "CVE-2026-84391",
    "datePublished": "2026-09-08T16:41:50.685Z",
    "dateReserved": "2026-09-01T16:36:11.927Z",
    "dateUpdated": "2026-09-08T17:29:43.459Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-84391",
      "date": "2026-09-14",
      "epss": "0.00235",
      "percentile": "0.14449"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-84391\",\"sourceIdentifier\":\"psirt@fortinet.com\",\"published\":\"2026-09-08T17:18:37.520\",\"lastModified\":\"2026-09-08T18:35:10.323\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via \u003cinsert attack vector here\u003e\"}],\"affected\":[{\"source\":\"psirt@fortinet.com\",\"affectedData\":[{\"vendor\":\"Fortinet\",\"product\":\"FortiAnalyzer\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:2.3:o:fortinet:fortianalyzer:7.6.6:*:*:*:*:*:*:*\",\"cpe:2.3:o:fortinet:fortianalyzer:7.6.5:*:*:*:*:*:*:*\",\"cpe:2.3:o:fortinet:fortianalyzer:7.6.4:*:*:*:*:*:*:*\",\"cpe:2.3:o:fortinet:fortianalyzer:7.6.3:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"7.6.3\",\"lessThanOrEqual\":\"7.6.6\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@fortinet.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-08T17:29:24.379449Z\",\"id\":\"CVE-2026-84391\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"psirt@fortinet.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-457\"}]}],\"references\":[{\"url\":\"https://fortiguard.fortinet.com/psirt/FG-IR-26-172\",\"source\":\"psirt@fortinet.com\"}]}}"
  }
}



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.