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NCSC-2026-0015

Vulnerability from csaf_ncscnl - Published: 2026-01-15 12:31 - Updated: 2026-09-10 14:21
Summary
Kwetsbaarheid verholpen in Fortinet FortiOS
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Fortinet heeft een kwetsbaarheid verholpen in FortiOS (Specifiek voor FortiSASE en FortiSwitchManager).
Interpretaties: De kwetsbaarheid bevindt zich in de cw_acd daemon in FortiOS en FortiSwitchManager. Deze daemon is kwetsbaar voor exploitatie door externe, niet-geauthenticeerde aanvallers. Door het verzenden van speciaal vervaardigde pakketten of verzoeken, kunnen aanvallers willekeurige code of commando's op de getroffen systemen uitvoeren. **UPDATE** Het Amerikaanse CISA heeft op 9 september de kwetsbaarheid op de Known Exploited Vulnerabilities-catalogus geplaatst. Organisaties wordt geadviseerd de updates van Fortinet direct toe te passen en kwetsbare, extern bereikbare systemen te controleren op aanwijzingen van misbruik. **EINDE UPDATE**
Oplossingen: Fortinet heeft updates uitgebracht om de kwetsbaarheid te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-122: Heap-based Buffer Overflow
CWE-787: Out-of-bounds Write
CVE-2025-25249

A heap-based buffer overflow vulnerability in multiple Fortinet products including FortiOS, FortiSwitchManager, and FortiSASE allows remote attackers to execute unauthorized code or commands via specially crafted packets.

8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C
CWE-122 - Heap-based Buffer Overflow
Affected products
Product Identifier Version Remediation
vers:unknown/*
Fortinet / FortiOS
 vers:unknown/*
vers:unknown/*
Fortinet / FortiSwitchManager
 vers:unknown/*
References
To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Fortinet heeft een kwetsbaarheid verholpen in FortiOS (Specifiek voor FortiSASE en FortiSwitchManager).",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheid bevindt zich in de cw_acd daemon in FortiOS en FortiSwitchManager. Deze daemon is kwetsbaar voor exploitatie door externe, niet-geauthenticeerde aanvallers. Door het verzenden van speciaal vervaardigde pakketten of verzoeken, kunnen aanvallers willekeurige code of commando\u0027s op de getroffen systemen uitvoeren.\n\n**UPDATE**\nHet Amerikaanse CISA heeft op 9 september de kwetsbaarheid op de Known Exploited Vulnerabilities-catalogus geplaatst. Organisaties wordt geadviseerd de updates van Fortinet direct toe te passen en kwetsbare, extern bereikbare systemen te controleren op aanwijzingen van misbruik.\n**EINDE UPDATE**",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Fortinet heeft updates uitgebracht om de kwetsbaarheid te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Heap-based Buffer Overflow",
        "title": "CWE-122"
      },
      {
        "category": "general",
        "text": "Out-of-bounds Write",
        "title": "CWE-787"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://fortiguard.fortinet.com/psirt/FG-IR-25-084"
      }
    ],
    "title": "Kwetsbaarheid verholpen in Fortinet FortiOS",
    "tracking": {
      "current_release_date": "2026-09-10T14:21:16.974644Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0015",
      "initial_release_date": "2026-01-15T12:31:57.265723Z",
      "revision_history": [
        {
          "date": "2026-01-15T12:31:57.265723Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        },
        {
          "date": "2026-09-10T14:21:16.974644Z",
          "number": "1.0.1",
          "summary": "Aan deze advisory is toegevoegd dat deze kwetsbaarheid is opgenomen in de KEV-catalogus."
        }
      ],
      "status": "final",
      "version": "1.0.1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "FortiOS"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-2"
                }
              }
            ],
            "category": "product_name",
            "name": "FortiSwitchManager"
          }
        ],
        "category": "vendor",
        "name": "Fortinet"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-25249",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "other",
          "text": "Heap-based Buffer Overflow",
          "title": "CWE-122"
        },
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "A heap-based buffer overflow vulnerability in multiple Fortinet products including FortiOS, FortiSwitchManager, and FortiSASE allows remote attackers to execute unauthorized code or commands via specially crafted packets.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-25249 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2025/cve-2025-25249.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2"
          ]
        }
      ],
      "title": "CVE-2025-25249"
    }
  ]
}



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