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Fencer Intel
high 8.8

CVE-2025-21241 json

Windows Telephony Service Remote Code Execution Vulnerability

published last yr. modified 4mo ago also EUVD-2025-2308

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

Windows Telephony Service Remote Code Execution Vulnerability

Patch / fix

  • Microsoft Windows 10 Version 1507 10.0.10240.20890
  • Microsoft Windows 10 Version 1607 10.0.14393.7699
  • Microsoft Windows 10 Version 1809 10.0.17763.6775
  • Microsoft Windows 10 Version 21H2 10.0.19044.5371
  • Microsoft Windows 10 Version 22H2 10.0.19045.5371
  • Microsoft Windows 11 version 22H2 10.0.22621.4751
  • Microsoft Windows 11 version 22H3 10.0.22631.4751
  • Microsoft Windows 11 Version 23H2 10.0.22631.4751
  • Microsoft Windows 11 Version 24H2 10.0.26100.2894
  • Microsoft Windows Server 2016 10.0.14393.7699
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.7699
  • Microsoft Windows Server 2019 10.0.17763.6775
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.6775
  • Microsoft Windows Server 2022 10.0.20348.3091
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1369
  • Microsoft Windows Server 2025 10.0.26100.2894
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.2894

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

1.51% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1507
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 version 22H2
  • Microsoft Windows 11 version 22H3
  • Microsoft Windows 11 Version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.