{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "azl3 python-urllib3 2.0.7-4 versions ant\u00e9rieures \u00e0 2.0.7-5",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft Malware Protection Engine",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "azl3 vim 9.2.0392-1 versions ant\u00e9rieures \u00e0 9.2.0488-1",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "azl3 openvswitch 3.3.0-2 versions ant\u00e9rieures \u00e0 3.3.0-3",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft Defender Antimalware Platform",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": null,
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-34956",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34956"
    },
    {
      "name": "CVE-2026-45584",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45584"
    },
    {
      "name": "CVE-2026-41091",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-41091"
    },
    {
      "name": "CVE-2026-46483",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46483"
    },
    {
      "name": "CVE-2026-44431",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-44431"
    },
    {
      "name": "CVE-2026-45498",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45498"
    }
  ],
  "initial_release_date": "2026-05-20T00:00:00",
  "last_revision_date": "2026-05-20T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0623",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-05-20T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
    },
    {
      "description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
    },
    {
      "description": "D\u00e9ni de service"
    },
    {
      "description": "\u00c9l\u00e9vation de privil\u00e8ges"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans les produits Microsoft. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code arbitraire \u00e0 distance, une \u00e9l\u00e9vation de privil\u00e8ges et un d\u00e9ni de service.\n\nMicrosoft indique que les vuln\u00e9rabilit\u00e9s CVE-2026-41091 et CVE-2026-45498 sont activement exploit\u00e9es.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans les produits Microsoft",
  "vendor_advisories": [
    {
      "published_at": "2026-05-19",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-45498",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498"
    },
    {
      "published_at": "2026-05-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-34956",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34956"
    },
    {
      "published_at": "2026-05-16",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-44431",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44431"
    },
    {
      "published_at": "2026-05-19",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-45584",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584"
    },
    {
      "published_at": "2026-05-17",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-46483",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46483"
    },
    {
      "published_at": "2026-05-19",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-41091",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41091"
    }
  ]
}

{
  "cisaActionDue": "2026-06-03",
  "cisaExploitAdd": "2026-05-20",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "Microsoft Defender Denial of Service Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:defender_antimalware_platform:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EE400D53-CA9B-433A-BB02-048BFDE09034",
              "versionEndExcluding": "4.18.26040.7",
              "versionStartIncluding": "4.18.26030.3011",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Microsoft Defender Denial of Service Vulnerability"
    }
  ],
  "id": "CVE-2026-45498",
  "lastModified": "2026-05-20T19:05:46.837",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 4.0,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 1.4,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-20T13:16:36.780",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-45498"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-20T13:16:36Z",
    "severity": "MODERATE"
  },
  "details": "Microsoft Defender Denial of Service Vulnerability",
  "id": "GHSA-8gp3-pghr-6wxp",
  "modified": "2026-05-20T18:31:34Z",
  "published": "2026-05-20T15:35:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45498"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Low"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-45498 Microsoft Defender Denial of Service Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498"
      },
      {
        "category": "self",
        "summary": "CVE-2026-45498 Microsoft Defender Denial of Service Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45498.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Microsoft Defender Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2026-05-19T07:00:00.000Z",
      "generator": {
        "date": "2026-05-20T03:33:54.501Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-45498",
      "initial_release_date": "2026-05-12T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-19T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-45498",
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Last version of the Microsoft Defender Antimalware Platform affected by this vulnerability: Last version of the Microsoft Defender Antimalware Platform affected by this vulnerability, 4.18.26030.3011: 4.18.26030.3011, First version of the Microsoft Defender Antimalware Platform with this vulnerability addressed: First version of the Microsoft Defender Antimalware Platform with this vulnerability addressed, Version 4.18.26040.7: Version 4.18.26040.7\nSee Manage Updates Baselines Microsoft Defender Antivirus for more information.\nVulnerability scanners are looking for specific binaries and version numbers on devices. Microsoft Defender files are still on disk even when disabled. Systems that have disabled Microsoft Defender are not in an exploitable state.\nIn response to a constantly changing threat landscape, Microsoft frequently updates malware definitions and the Windows Defender Antimalware Platform. In order to be effective in helping protect against new and prevalent threats, antimalware software must be kept up to date with these updates in a timely manner.\nFor enterprise deployments as well as end users, the default configuration in Microsoft antimalware software helps ensure that malware definitions and the Windows Defender Antimalware Platform are kept up to date automatically. Product documentation also recommends that products are configured for automatic updating.\nBest practices recommend that customers regularly verify whether software distribution, such as the automatic deployment of Windows Defender Antimalware Platform updates and malware definitions, is working as expected in their environment.\nMicrosoft typically releases an update for the Microsoft Defender Antimalware Platform once a month or as needed to protect against new threats. Microsoft also typically updates the malware definitions three times daily and can increase the frequency when needed.\nDepending on which Microsoft antimalware software is used and how it is configured, the software may search for platform, engine and definition updates every day when connected to the Internet, up to multiple times daily. Customers can also choose to manually check for updates at any time.\nThe Microsoft Defender Antimalware Platform is a collection of user-mode binaries (e.g. MsMpEng.exe) and kernel-mode drivers that run on top of Windows to keep devices protected against new and prevalent threats.\nDefender runs on all supported versions of Windows.\nYes, Microsoft System Center Endpoint Protection, Microsoft System Center 2012 R2 Endpoint Protection, Microsoft System Center 2012 Endpoint Protection and Microsoft Security Essentials.\nYes.\u00a0 In addition to the changes that are listed for this vulnerability, this update includes defense-in-depth updates to help improve security-related features.\nCustomers should verify that the latest version of the Microsoft Malware Protection Platform and definition updates are being actively downloaded and installed for their Microsoft antimalware products.\nOpen the Windows Security program. For example, type Security in the Search bar, and select the Windows Security program.\nIn the navigation pane, select Virus \u0026amp; threat protection.\nThen click on Protection Updates in the Virus \u0026amp; threat protection section updates.\nSelect Check for updates.\nIn the navigation pane, select Settings, and then select About.\nExamine the Antimalware ClientVersion number. The update was successfully installed if the Malware Protection Platform version number or the signature package version number matches or exceeds the version number that you are trying to verify as installed.",
          "title": "Microsoft Defender is disabled in my environment, why are vulnerability scanners showing that I am vulnerable to this issue?"
        }
      ],
      "product_status": {
        "fixed": [
          "11744"
        ],
        "known_affected": [
          "1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45498 Microsoft Defender Denial of Service Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498"
        },
        {
          "category": "self",
          "summary": "CVE-2026-45498 Microsoft Defender Denial of Service Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45498.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 4.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 3.5,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Denial of Service"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:Yes;Exploited:Yes;Latest Software Release:Exploitation Detected"
        }
      ],
      "title": "Microsoft Defender Denial of Service Vulnerability"
    }
  ]
}