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PatchSiren cyber security CVE debrief

CVE-2025-59227 Microsoft CVE debrief

CVE-2025-59227 is a high-severity Microsoft Office use-after-free vulnerability that can lead to local code execution. NVD maps the issue to multiple Office product lines, including Microsoft 365 Apps, Office 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, and Office for Android, with Microsoft’s advisory as the referenced vendor source. The CVSS vector indicates local exploitation, low attack complexity, no privileges required, and user interaction required.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2025-10-14
Original CVE updated
2025-10-16
Advisory published
2025-10-14
Advisory updated
2025-10-16

Who should care

Security teams and administrators managing Microsoft Office deployments should prioritize this CVE, especially in environments with many desktop users or where Office documents from untrusted sources are routinely opened. Endpoint security teams, vulnerability management teams, and help desks supporting Microsoft 365 Apps and Office LTSC estates should track remediation closely.

Technical summary

NVD describes the flaw as a use-after-free (CWE-416) in Microsoft Office. The supplied CVSS vector is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, which indicates a local attack path, no privileges required, and user interaction required, with high potential impact if exploitation succeeds. The NVD record marks the vulnerability status as analyzed and links to Microsoft’s advisory for vendor guidance.

Defensive priority

High. The combination of broad Office exposure, user interaction requirements, and high confidentiality/integrity/availability impact makes this a priority issue for enterprise endpoint fleets.

Recommended defensive actions

  • Review Microsoft’s MSRC advisory for CVE-2025-59227 and apply the vendor-recommended fix or update when available.
  • Prioritize patch deployment for endpoints running Microsoft 365 Apps, Office 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, and Office on Android where applicable.
  • Reduce exposure to untrusted Office files and attachments until remediation is complete, especially on user workstations that regularly handle external documents.
  • Use standard endpoint and vulnerability management controls to confirm remediation across x86, x64, macOS, and Android Office installations listed by NVD.

Evidence notes

This debrief is based only on the supplied NVD/CVE metadata and the referenced Microsoft advisory link. The vulnerability type (use after free / CWE-416), CVSS vector, affected product families, and publication dates come from the provided corpus. No exploit details, weaponization guidance, or remediation build numbers were included in the source corpus.

Official resources

Microsoft’s advisory reference for CVE-2025-59227 is dated 2025-10-14, matching the CVE publication date supplied in the corpus; the record was modified on 2025-10-16.