CVE-2025-21240: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1507
Windows Telephony Service Remote Code Execution Vulnerability
AI Analysis
Technical Summary
This vulnerability (CVE-2025-21240) is a heap-based buffer overflow in the Windows Telephony Service on Windows 10 Version 1507 (build 10.0.10240.0). It allows remote attackers to execute arbitrary code remotely, potentially leading to full system compromise. The CVSS 3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, no privileges required, but user interaction is necessary. Microsoft has released an official patch to remediate this issue.
Potential Impact
Successful exploitation could allow remote code execution with full system impact, including confidentiality, integrity, and availability compromise. The vulnerability requires user interaction but no privileges, making it a significant risk if exploited.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1507 (build 10.0.10240.0) as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21240.
CVE-2025-21240: 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
This vulnerability (CVE-2025-21240) is a heap-based buffer overflow in the Windows Telephony Service on Windows 10 Version 1507 (build 10.0.10240.0). It allows remote attackers to execute arbitrary code remotely, potentially leading to full system compromise. The CVSS 3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, no privileges required, but user interaction is necessary. Microsoft has released an official patch to remediate this issue.
Potential Impact
Successful exploitation could allow remote code execution with full system impact, including confidentiality, integrity, and availability compromise. The vulnerability requires user interaction but no privileges, making it a significant risk if exploited.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1507 (build 10.0.10240.0) as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21240.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2024-12-10T23:54:12.923Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21240","vendor":"Microsoft"}]
Threat ID: 68c0c0d09ed239a66badfcf2
Added to database: 09/10/2025, 00:05:36 UTC
Last enriched: 06/10/2026, 09:45:16 UTC
Last updated: 07/08/2026, 10:28:16 UTC
Views: 225
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