CVE-2025-21186: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Microsoft Access Remote Code Execution Vulnerability
AI Analysis
Technical Summary
CVE-2025-21186 is a heap-based buffer overflow vulnerability (CWE-122) in Microsoft Access within Microsoft 365 Apps for Enterprise. The flaw could enable remote code execution under certain conditions. The vulnerability has been assigned a CVSS v3.1 score of 7.8, indicating high severity. Microsoft has published an official fix and manages remediation for this cloud service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation of this vulnerability could lead to remote code execution with high impact on confidentiality, integrity, and availability. This means an attacker could potentially execute arbitrary code in the context of the affected application, leading to full compromise of the affected system or data.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to Microsoft's guidance available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21186.
CVE-2025-21186: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Description
Microsoft Access Remote Code Execution Vulnerability
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-21186 is a heap-based buffer overflow vulnerability (CWE-122) in Microsoft Access within Microsoft 365 Apps for Enterprise. The flaw could enable remote code execution under certain conditions. The vulnerability has been assigned a CVSS v3.1 score of 7.8, indicating high severity. Microsoft has published an official fix and manages remediation for this cloud service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation of this vulnerability could lead to remote code execution with high impact on confidentiality, integrity, and availability. This means an attacker could potentially execute arbitrary code in the context of the affected application, leading to full compromise of the affected system or data.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to Microsoft's guidance available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21186.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2024-12-05T21:43:30.764Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21186","vendor":"Microsoft"}]
Threat ID: 68c0bd4c9ed239a66badea43
Added to database: 09/09/2025, 23:50:36 UTC
Last enriched: 06/10/2026, 09:41:19 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 116
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