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PatchSiren cyber security CVE debrief

CVE-2025-62554 Microsoft CVE debrief

Microsoft Office vulnerability CVE-2025-62554 allows unauthorized local code execution via type confusion. Defenders should assess exposure, prioritize remediation, and verify affected systems. The vulnerability has a CVSS score of 8.4 and is classified as HIGH severity. Affected systems need immediate attention and remediation priority is high due to severity. Defenders responsible for Microsoft Office and Microsoft 365 Apps for Enterprise systems should assess exposure and prioritize remediation.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 8.4
CISA KEV
Not listed in stored evidence
Original CVE published
2025-12-09
Original CVE updated
2026-09-30
Advisory published
2025-12-09
Advisory updated
2026-09-30

Who should care

Defenders responsible for Microsoft Office and Microsoft 365 Apps for Enterprise systems should assess exposure and prioritize remediation. Operators, platforms, vulnerability-management, and security teams are impacted by this vulnerability. They should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2025-62554 allows unauthorized local code execution in Microsoft Office via type confusion. Defenders should assess exposure, prioritize remediation, and verify affected systems.

  • Local code execution requires verification
  • Affected systems need immediate attention
  • Remediation priority is high due to severity

Technical summary

CVE-2025-62554 is a type confusion vulnerability in Microsoft Office that allows unauthorized local code execution. The vulnerability has a CVSS score of 8.4 and is classified as HIGH severity. Affected product deployments exist in managed environments and require verification. Official advisory or CVE record should be reviewed to validate affected scope, severity, and vendor guidance.

Defensive priority

High

Recommended defensive actions

  • Assess exposure of Microsoft Office and Microsoft 365 Apps for Enterprise systems
  • Prioritize remediation of affected systems
  • Verify system inventory and apply vendor patches

Evidence notes

Official CVE Program record and NVD vulnerability detail provide information on CVE-2025-62554. Vendor advisory from Microsoft is also available. The CVE record was published on 2025-12-09T18:16:00.620Z and has not been modified since then. The vulnerability allows unauthorized local code execution in Microsoft Office via type confusion.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-62554 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-62554

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-62554 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-62554

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.