CVE-2025-21221: Windows Telephony Service Remote Code Execution Vulnerability
First published: Tue Apr 08 2025(Updated: )
<p>Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.</p>
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows Server 2025 | ||
| Microsoft Windows Server 2012 R2 | ||
| Windows 11 | =23H2 | |
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2025 | ||
| Microsoft Windows Server | ||
| Windows 11 | =22H2 | |
| Windows 10 | =1809 | |
| Microsoft Windows Server 2008 R2 | ||
| Windows 10 | =21H2 | |
| Microsoft Windows Server 2012 R2 | ||
| Windows 10 | =1809 | |
| Microsoft Windows Server 2008 R2 | ||
| Windows 11 | =22H2 | |
| Windows 10 | =1607 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2022 23H2 | ||
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Windows 11 | =23H2 | |
| Microsoft Windows Server | ||
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server 2019 | ||
| Windows 11 | =24H2 | |
| Microsoft Windows Server | ||
| Windows 10 | =1607 | |
| Windows 10 | =21H2 | |
| Windows 10 | =21H2 | |
| Microsoft Windows Server | ||
| Windows 11 | =24H2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2019 | ||
| Windows 10 | ||
| Windows 10 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-21221?
CVE-2025-21221 is classified as a critical severity vulnerability due to its potential to allow remote code execution.
How do I fix CVE-2025-21221?
To fix CVE-2025-21221, apply the latest security updates provided by Microsoft for your affected Windows version.
What products are affected by CVE-2025-21221?
CVE-2025-21221 affects several versions of Windows, including Windows Server 2025, Windows Server 2012 R2, Windows 11, and various editions of Windows 10.
Can CVE-2025-21221 be exploited remotely?
Yes, CVE-2025-21221 can be exploited remotely, allowing unauthorized attackers to execute arbitrary code over a network.
Is there a patch available for CVE-2025-21221?
Yes, Microsoft has released patches to address CVE-2025-21221 for the affected Windows products.
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- vendor/microsoft
- canonical/microsoft windows server 2025
- canonical/microsoft windows server 2012 r2
- canonical/windows 11
- version/windows 11/23h2
- canonical/windows 10
- version/windows 10/22h2
- canonical/microsoft windows server
- version/windows 11/22h2
- version/windows 10/1809
- canonical/microsoft windows server 2008 r2
- version/windows 10/21h2
- version/windows 10/1607
- canonical/microsoft windows server 2016
- canonical/microsoft windows server 2022 23h2
- canonical/microsoft windows server 2022
- canonical/microsoft windows server 2019
- version/windows 11/24h2