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CVE-2025-27477— Windows Telephony Service Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1507
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows Telephony Server是美国微软（Microsoft）公司的一个组件，它支持电话应用程序编程接口（TAPI），允许计算机程序与共享的电话服务进行通信。 Microsoft Windows Telephony Server存在安全漏洞。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Windows Server

CVSS 8.8 · High EPSS 1.53% · P72

Affected Version Matrix 25

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1507 10.0.10240.0< 10.0.10240.20978 affected
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.7969 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.7136 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.5737 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.5737 affected
Microsoft Windows 11 version 22H2 10.0.22621.0< 10.0.22621.5189 affected
Microsoft Windows 11 version 22H3 10.0.22631.0< 10.0.22631.5189 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.5189 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.3775 affected
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0< 6.1.7601.27670 affected
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0< 6.1.7601.27670 affected
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0< 6.0.6003.23220 affected
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0< 6.0.6003.23220 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.25423 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.25423 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.22523 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.22523 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.7969 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.7969 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.7136 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.7136 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.3453 affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0< 10.0.25398.1551 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.3775 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.3775 affected
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I. Basic Information for CVE-2025-27477

Vulnerability Information
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Vulnerability Title
Windows Telephony Service Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Telephony Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Telephony Server是美国微软（Microsoft）公司的一个组件，它支持电话应用程序编程接口（TAPI），允许计算机程序与共享的电话服务进行通信。 Microsoft Windows Telephony Server存在安全漏洞。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Windows Server
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 10 Version 1507 10.0.10240.0 ~ 10.0.10240.20978 -
Microsoft Windows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.7969 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.7136 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.5737 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.5737 -
Microsoft Windows 11 version 22H2 10.0.22621.0 ~ 10.0.22621.5189 -
Microsoft Windows 11 version 22H3 10.0.22631.0 ~ 10.0.22631.5189 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.5189 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.3775 -
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.27670 -
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.27670 -
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.23220 -
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.23220 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.25423 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.25423 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.22523 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.22523 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.7969 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.7969 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.7136 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.7136 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.3453 -
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.1551 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.3775 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.3775 -

II. Public POCs for CVE-2025-27477

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III. Intelligence Information for CVE-2025-27477

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Vendor Advisories for CVE-2025-27477 (1)

Same Patch Batch · Microsoft · 2025-04-08 · 119 CVEs total

CVE-2025-21205 8.8 HIGH Windows Telephony Service Remote Code Execution Vulnerability
CVE-2025-21221 8.8 HIGH Windows Telephony Service Remote Code Execution Vulnerability
CVE-2025-26669 8.8 HIGH Windows Routing and Remote Access Service (RRAS) Information Disclosure Vulnerability
CVE-2025-29794 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2025-27740 8.8 HIGH Active Directory Certificate Services Elevation of Privilege Vulnerability
CVE-2025-21222 8.8 HIGH Windows Telephony Service Remote Code Execution Vulnerability
CVE-2025-26647 8.8 HIGH Windows Kerberos Elevation of Privilege Vulnerability
CVE-2025-27481 8.8 HIGH Windows Telephony Service Remote Code Execution Vulnerability
CVE-2025-27737 8.6 HIGH Windows Security Zone Mapping Security Feature Bypass Vulnerability
CVE-2025-26678 8.4 HIGH Windows Defender Application Control Security Feature Bypass Vulnerability
CVE-2025-26663 8.1 HIGH Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability
CVE-2025-27482 8.1 HIGH Windows Remote Desktop Services Remote Code Execution Vulnerability
CVE-2025-27480 8.1 HIGH Windows Remote Desktop Services Remote Code Execution Vulnerability
CVE-2025-26671 8.1 HIGH Windows Remote Desktop Services Remote Code Execution Vulnerability
CVE-2025-26670 8.1 HIGH Lightweight Directory Access Protocol (LDAP) Client Remote Code Execution Vulnerability
CVE-2025-27487 8.0 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2025-24062 7.8 HIGH Microsoft DWM Core Library Elevation of Privilege Vulnerability
CVE-2025-24074 7.8 HIGH Microsoft DWM Core Library Elevation of Privilege Vulnerability
CVE-2025-24073 7.8 HIGH Microsoft DWM Core Library Elevation of Privilege Vulnerability
CVE-2025-26674 7.8 HIGH Windows Media Remote Code Execution Vulnerability

Showing top 20 of 119 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1507
Same vendor: Microsoft
Same weakness: CWE-122

V. Comments for CVE-2025-27477

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