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High severity · published Mar 10, 2026
CVE-2026-25188
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to elevate privileges over an adjacent network
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to elevate privileges over an adjacent network.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 10 1607 · Microsoft
before 10.0.14393.8957; before 10.0.14393.8957 · source: NVD
W1
Windows 10 1809 · Microsoft
before 10.0.17763.8511; before 10.0.17763.8511 · source: NVD
W1
Windows 10 21h2 · Microsoft
before 10.0.19044.7058; before 10.0.19044.7058; before 10.0.19044.7058 · source: NVD
W1
Windows 10 22h2 · Microsoft
before 10.0.19045.7058; before 10.0.19045.7058; before 10.0.19045.7058 · source: NVD
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.6783; before 10.0.22631.6783 · source: NVD
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.7979; before 10.0.26100.7979 · source: NVD
W1
Windows 11 25h2 · Microsoft
before 10.0.26200.7979; before 10.0.26200.7979 · source: NVD
W1
Windows 11 26h1 · Microsoft
before 10.0.28000.1719; before 10.0.28000.1719 · source: NVD
WS
Windows Server 2012 · Microsoft
r2 · source: NVD
WS
Windows Server 2016 · Microsoft
before 10.0.14393.8957 · source: NVD
WS
Windows Server 2019 · Microsoft
before 10.0.17763.8511 · source: NVD
WS
Windows Server 2022 · Microsoft
before 10.0.20348.4830 · source: NVD
Affected product
W1
Windows 10 1607
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25188
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25188
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-25188
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