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CVE-2025-21371

25
FAUCET Score

CVE-2025-21371 is a high-severity Remote Code Execution vulnerability affecting the Windows Telephony Service across Microsoft products. This vulnerability can be exploited remotely with low attack complexity, requiring user interaction, and could lead to complete compromise of confidentiality, integrity, and availability. While not currently in the KEV catalog or actively exploited, its high CVSS score of 8.8 and mention in recent media coverage indicate its significant potential impact. There is no public exploit code available, and community discussion is limited.

Impacted Technologies

VendorProductVersion(s)CPE
< 10.0.10240.20915CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:*
< 10.0.10240.20915CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*
< 10.0.14393.7785CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
< 10.0.14393.7785CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
< 10.0.17763.6893CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.60%
Probability of exploitation in next 30 days
EPSS Percentile
83.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0260 is in the 83rd percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (44)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for 32-bit SystemsFixed in: 10.0.17763.6893
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for x64-based SystemsFixed in: 10.0.17763.6893
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2019Fixed in: 10.0.17763.6893
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2019 (Server Core installation)Fixed in: 10.0.17763.6893
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2022Fixed in: 10.0.20348.3207
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2022 (Server Core installation)Fixed in: 10.0.20348.3207
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2022Fixed in: 10.0.20348.3148
microsoftpatch availablevia msrc
Product: Windows Server 2022 (Server Core installation)Fixed in: 10.0.20348.3148
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H2 for 32-bit SystemsFixed in: 10.0.19044.5487
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H2 for ARM64-based SystemsFixed in: 10.0.19044.5487
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H2 for x64-based SystemsFixed in: 10.0.19044.5487
View patch
microsoftpatch availablevia msrc
Product: Windows 11 Version 22H2 for ARM64-based SystemsFixed in: 10.0.22621.4890
View patch
microsoftpatch availablevia msrc
Product: Windows 11 Version 22H2 for x64-based SystemsFixed in: 10.0.22621.4890
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 22H2 for x64-based SystemsFixed in: 10.0.19045.5487
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 22H2 for ARM64-based SystemsFixed in: 10.0.19045.5487
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 22H2 for 32-bit SystemsFixed in: 10.0.19045.5487
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2025 (Server Core installation)Fixed in: 10.0.26100.3194
View patch
microsoftpatch availablevia msrc
Product: Windows 11 Version 24H2 for ARM64-based SystemsFixed in: 10.0.26100.3194
View patch
microsoftpatch availablevia msrc
Product: Windows 11 Version 24H2 for x64-based SystemsFixed in: 10.0.26100.3194
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2025Fixed in: 10.0.26100.3194
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2025 (Server Core installation)Fixed in: 10.0.26100.3107
microsoftpatch availablevia msrc
Product: Windows 11 Version 24H2 for ARM64-based SystemsFixed in: 10.0.26100.3107
microsoftpatch availablevia msrc
Product: Windows 11 Version 24H2 for x64-based SystemsFixed in: 10.0.26100.3107
microsoftpatch availablevia msrc
Product: Windows Server 2025Fixed in: 10.0.26100.3107
microsoftpatch availablevia msrc
Product: Windows 11 Version 23H2 for ARM64-based SystemsFixed in: 10.0.22631.4890
View patch
microsoftpatch availablevia msrc
Product: Windows 11 Version 23H2 for x64-based SystemsFixed in: 10.0.22631.4890
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2022, 23H2 Edition (Server Core installation)Fixed in: 10.0.25398.1425
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for 32-bit SystemsFixed in: 10.0.10240.20915
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for x64-based SystemsFixed in: 10.0.10240.20915
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for 32-bit SystemsFixed in: 10.0.14393.7785
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for x64-based SystemsFixed in: 10.0.14393.7785
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016Fixed in: 10.0.14393.7785
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016 (Server Core installation)Fixed in: 10.0.14393.7785
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for 32-bit Systems Service Pack 2Fixed in: 6.0.6003.23117
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)Fixed in: 6.0.6003.23117
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for x64-based Systems Service Pack 2Fixed in: 6.0.6003.23117
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)Fixed in: 6.0.6003.23117
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 R2 for x64-based Systems Service Pack 1Fixed in: 6.1.7601.27566
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)Fixed in: 6.1.7601.27566
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012Fixed in: 6.2.9200.25317
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 (Server Core installation)Fixed in: 6.2.9200.25317
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 R2Fixed in: 6.3.9600.22417
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 R2 (Server Core installation)Fixed in: 6.3.9600.22417
View patch

Vendor Advisories (1)

microsoft2025-Feb/CVE-2025-21371Important

Windows Telephony Service Remote Code Execution Vulnerability

Feb 11, 2025

References

vicarius.io / vsociety/posts/windows-telephony-service-remote-code-execution-vulnerability-detection-script
vicarius.io / vsociety/posts/windows-telephony-service-remote-code-execution-vulnerability-mitigation-script
msrc.microsoft.com / update-guide/vulnerability/CVE-2025-21371
PatchVendor Advisory