CVE-2025-21409: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1507
Windows Telephony Service Remote Code Execution Vulnerability
AI Analysis
Technical Summary
CVE-2025-21409 is a heap-based buffer overflow vulnerability (CWE-122) in the Windows Telephony Service component of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The flaw allows an unauthenticated attacker to remotely execute code on the affected system, potentially leading to full system compromise. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high severity. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow remote code execution without privileges, user interaction is required, and it affects system confidentiality, integrity, and availability. This could lead to complete system compromise on affected Windows 10 Version 1507 systems.
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-2025-21409 to remediate this vulnerability.
CVE-2025-21409: 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-2025-21409 is a heap-based buffer overflow vulnerability (CWE-122) in the Windows Telephony Service component of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The flaw allows an unauthenticated attacker to remotely execute code on the affected system, potentially leading to full system compromise. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high severity. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow remote code execution without privileges, user interaction is required, and it affects system confidentiality, integrity, and availability. This could lead to complete system compromise on affected Windows 10 Version 1507 systems.
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-2025-21409 to remediate this vulnerability.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2024-12-11T00:29:48.376Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21409","vendor":"Microsoft"}]
Threat ID: 68c0c0d09ed239a66badfd20
Added to database: 09/10/2025, 00:05:36 UTC
Last enriched: 06/10/2026, 10:01:36 UTC
Last updated: 07/07/2026, 22:28:16 UTC
Views: 260
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.