{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "J\u0026#233;r\u0026#233;mie Fr\u0026#233;reault"
        ]
      },
      {
        "names": [
          "J\u0026#233;r\u0026#233;mie Fr\u0026#233;reault"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "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-2025-21259 Microsoft Outlook Spoofing Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21259"
      },
      {
        "category": "self",
        "summary": "CVE-2025-21259 Microsoft Outlook Spoofing Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-21259.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 Outlook Spoofing Vulnerability",
    "tracking": {
      "current_release_date": "2025-02-11T08:00:00.000Z",
      "generator": {
        "date": "2025-03-19T17:45:57.577Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2025-21259",
      "initial_release_date": "2025-02-11T08:00:00.000Z",
      "revision_history": [
        {
          "date": "2025-02-11T08:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c4.2501.1",
            "product": {
              "name": "Microsoft Outlook for Android \u003c4.2501.1",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "4.2501.1",
            "product": {
              "name": "Microsoft Outlook for Android 4.2501.1",
              "product_id": "10685"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Outlook for Android"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-21259",
      "cwe": {
        "id": "CWE-451",
        "name": "User Interface (UI) Misrepresentation of Critical Information"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker\u0027s message can inherit the sender\u0027s email address from another message in the UI. The attacker cannot control which message it inherits from. This issue occurs exclusively for messages in the Junk folder, as it is the only folder where the app displays the sender\u0027s email address. The attacker cannot affect confidentiality or availability.",
          "title": "According to the CVSS metric, Integrity (I:L) is Low. What does that mean for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "10685"
        ],
        "known_affected": [
          "1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-21259 Microsoft Outlook Spoofing Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21259"
        },
        {
          "category": "self",
          "summary": "CVE-2025-21259 Microsoft Outlook Spoofing Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-21259.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-02-11T08:00:00.000Z",
          "details": "4.2501.1:Security Update:https://learn.microsoft.com/en-us/officeupdates/release-notes-outlook-mobile",
          "product_ids": [
            "1"
          ],
          "url": "https://learn.microsoft.com/en-us/officeupdates/release-notes-outlook-mobile"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 4.6,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Spoofing"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Microsoft Outlook Spoofing Vulnerability"
    }
  ]
}