CVE-2026-70465

Status: AnalyzedHigh (8.1)—

A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base score: 8.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.52%
Percentile among all scored CVEs: 42
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access75 %
Primary impactT1059 Command and Scripting Interpreterexecution80 %

AV:N sin PR/UI permite explotación remota no autenticada. Buffer overflow (CWE-120) vía paquetes DNS maliciosos ejecuta código arbitrario en el cliente FortiClient.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account Management Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation Limit Access to Resource Over Network

Affected technologies (1)

Fortinet — Forticlient

CWEs

CWE-120

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-156

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-70465",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-70465",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-12T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@fortinet.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@fortinet.com",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:fortinet:forticlientwindows:7.4.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.4.2:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.4.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.4.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.11:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.10:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.9:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.8:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.7:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.6:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.2:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:forticlientwindows:7.2.0:*:*:*:*:*:*:*"
          ],
          "vendor": "Fortinet",
          "product": "FortiClientWindows",
          "versions": [
            {
              "status": "affected",
              "version": "7.4.0",
              "versionType": "semver",
              "lessThanOrEqual": "7.4.3"
            },
            {
              "status": "affected",
              "version": "7.2.0",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.11"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-12T12:19:47.017",
  "references": [
    {
      "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-156",
      "tags": [
        "Vendor Advisory",
        "Mitigation"
      ],
      "source": "psirt@fortinet.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@fortinet.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets."
    }
  ],
  "lastModified": "2026-09-08T21:03:37.110",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D671714A-3C4B-4653-884F-4A557C2ED5C7",
              "versionEndExcluding": "7.2.12",
              "versionStartIncluding": "7.2.0"
            },
            {
              "criteria": "cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "51121FCA-2CA9-4B4B-A27C-C4729AB797BB",
              "versionEndExcluding": "7.4.4",
              "versionStartIncluding": "7.4.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@fortinet.com"
}