High severity · published Jan 14, 2025
CVE-2025-21306
Windows Telephony Service Remote Code Execution Vulnerability
8.8
CVSS
1.4%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 10 1507 · Microsoft
before 10.0.10240.20890; before 10.0.10240.20890 · source: NVD
W1
Windows 10 1607 · Microsoft
before 10.0.14393.7699; before 10.0.14393.7699 · source: NVD
W1
Windows 10 1809 · Microsoft
before 10.0.17763.6775; before 10.0.17763.6775 · source: NVD
W1
Windows 10 21h2 · Microsoft
before 10.0.19044.5371 · source: NVD
W1
Windows 10 22h2 · Microsoft
before 10.0.19045.5371 · source: NVD
W1
Windows 11 22h2 · Microsoft
before 10.0.22621.4751 · source: NVD
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.4751 · source: NVD
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.2894 · source: NVD
WS
Windows Server 2008 · Microsoft
r2 · source: NVD
WS
Windows Server 2012 · Microsoft
r2 · source: NVD
WS
Windows Server 2016 · Microsoft
before 10.0.14393.7699 · source: NVD
WS
Windows Server 2019 · Microsoft
before 10.0.17763.6775 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-21306
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-21306
Patch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21306
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