CVE-2025-21266: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1507
Windows Telephony Service Remote Code Execution Vulnerability
AI Analysis
Technical Summary
CVE-2025-21266 is a heap-based buffer overflow vulnerability (CWE-122) in the Windows Telephony Service on Windows 10 Version 1507 (build 10.0.10240.0). It allows an unauthenticated attacker to remotely execute code with high impact on system confidentiality, integrity, and availability. The vulnerability has a CVSS 3.1 base score of 8.8 (high severity) and requires user interaction to exploit. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow remote code execution, leading to full compromise of the affected system's confidentiality, integrity, and availability. The attacker could execute arbitrary code in the context of the affected service, potentially gaining control over the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21266 to remediate this vulnerability.
CVE-2025-21266: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1507
Description
Windows Telephony Service Remote Code Execution Vulnerability
CVSS v3.1
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-21266 is a heap-based buffer overflow vulnerability (CWE-122) in the Windows Telephony Service on Windows 10 Version 1507 (build 10.0.10240.0). It allows an unauthenticated attacker to remotely execute code with high impact on system confidentiality, integrity, and availability. The vulnerability has a CVSS 3.1 base score of 8.8 (high severity) and requires user interaction to exploit. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow remote code execution, leading to full compromise of the affected system's confidentiality, integrity, and availability. The attacker could execute arbitrary code in the context of the affected service, potentially gaining control over the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21266 to remediate this vulnerability.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2024-12-10T23:54:12.935Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21266","vendor":"Microsoft"}]
Threat ID: 68c0bd4f9ed239a66badeaf8
Added to database: 09/09/2025, 23:50:39 UTC
Last enriched: 06/10/2026, 09:47:35 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 110
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