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TI-2025-20326 Aliases CVE-2025-27491GHSA-c8q9-g877-5qr3

Windows Hyper-V Remote Code Execution Vulnerability

Priority LOW 36CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Use after free in Windows Hyper-V allows an authorized attacker to execute code over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01429 73rd percentileScored 2026-11-07
Fix Fixed Microsoft: 8 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows 10 Version 150710.0.10240.0 to before 10.0.10240.2097810.0.10240.20978Patch availableCNA
MicrosoftWindows 10 Version 160710.0.14393.0 to before 10.0.14393.796910.0.14393.7969Patch availableCNA
MicrosoftWindows 10 Version 180910.0.17763.0 to before 10.0.17763.713610.0.17763.7136Patch availableCNA
MicrosoftWindows 10 Version 21H210.0.19044.0 to before 10.0.19044.573710.0.19044.5737Patch availableCNA
MicrosoftWindows 10 Version 22H210.0.19045.0 to before 10.0.19045.573710.0.19045.5737Patch availableCNA
MicrosoftWindows 11 version 22H210.0.22621.0 to before 10.0.22621.518910.0.22621.5189Patch availableCNA
MicrosoftWindows 11 version 22H310.0.22631.0 to before 10.0.22631.518910.0.22631.5189Patch availableCNA
MicrosoftWindows 11 Version 23H210.0.22631.0 to before 10.0.22631.518910.0.22631.5189Patch availableCNA
MicrosoftWindows 11 Version 24H210.0.26100.0 to before 10.0.26100.377510.0.26100.3775Patch availableCNA
MicrosoftWindows Server 201610.0.14393.0 to before 10.0.14393.796910.0.14393.7969Patch availableCNA
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 to before 10.0.14393.796910.0.14393.7969Patch availableCNA
MicrosoftWindows Server 201910.0.17763.0 to before 10.0.17763.713610.0.17763.7136Patch availableCNA
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 to before 10.0.17763.713610.0.17763.7136Patch availableCNA
MicrosoftWindows Server 202210.0.20348.0 to before 10.0.20348.345310.0.20348.3453Patch availableCNA
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 to before 10.0.25398.155110.0.25398.1551Patch availableCNA
MicrosoftWindows Server 202510.0.26100.0 to before 10.0.26100.377510.0.26100.3775Patch availableCNA
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 to before 10.0.26100.377510.0.26100.3775Patch availableCNA
  • Windows 10 Version 1507 VendorMicrosoft Affected 10.0.10240.0 to before 10.0.10240.20978 Fixed in 10.0.10240.20978 Patch available CNA
  • Windows 10 Version 1607 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.7969 Fixed in 10.0.14393.7969 Patch available CNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.7136 Fixed in 10.0.17763.7136 Patch available CNA
  • Windows 10 Version 21H2 VendorMicrosoft Affected 10.0.19044.0 to before 10.0.19044.5737 Fixed in 10.0.19044.5737 Patch available CNA
  • Windows 10 Version 22H2 VendorMicrosoft Affected 10.0.19045.0 to before 10.0.19045.5737 Fixed in 10.0.19045.5737 Patch available CNA
  • Windows 11 version 22H2 VendorMicrosoft Affected 10.0.22621.0 to before 10.0.22621.5189 Fixed in 10.0.22621.5189 Patch available CNA
  • Windows 11 version 22H3 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.5189 Fixed in 10.0.22631.5189 Patch available CNA
  • Windows 11 Version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.5189 Fixed in 10.0.22631.5189 Patch available CNA
  • Windows 11 Version 24H2 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.3775 Fixed in 10.0.26100.3775 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.7969 Fixed in 10.0.14393.7969 Patch available CNA
  • Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.7969 Fixed in 10.0.14393.7969 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.7136 Fixed in 10.0.17763.7136 Patch available CNA
  • Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.7136 Fixed in 10.0.17763.7136 Patch available CNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.20348.0 to before 10.0.20348.3453 Fixed in 10.0.20348.3453 Patch available CNA
  • Windows Server 2022, 23H2 Edition (Server Core installation) VendorMicrosoft Affected 10.0.25398.0 to before 10.0.25398.1551 Fixed in 10.0.25398.1551 Patch available CNA
  • Windows Server 2025 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.3775 Fixed in 10.0.26100.3775 Patch available CNA
  • Windows Server 2025 (Server Core installation) VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.3775 Fixed in 10.0.26100.3775 Patch available CNA

CPE configurations NVD · 16

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:*before 10.0.10240.20978VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*before 10.0.10240.20978VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*before 10.0.14393.7969VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*before 10.0.14393.7969VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*before 10.0.17763.7136VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*before 10.0.17763.7136VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*before 10.0.19044.5737VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*before 10.0.19045.5737VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*before 10.0.22621.5189VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*before 10.0.22631.5189VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:* Versions before 10.0.10240.20978 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:* Versions before 10.0.10240.20978 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* Versions before 10.0.14393.7969 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* Versions before 10.0.14393.7969 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* Versions before 10.0.17763.7136 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* Versions before 10.0.17763.7136 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* Versions before 10.0.19044.5737 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* Versions before 10.0.19045.5737 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:* Versions before 10.0.22621.5189 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* Versions before 10.0.22631.5189 Vulnerable ·Microsoft
Show 6 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*before 10.0.26100.3775VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*before 10.0.14393.7969VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*before 10.0.17763.7136VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*before 10.0.20348.3453VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*before 10.0.25398.1551VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*before 10.0.26100.3775VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* Versions before 10.0.26100.3775 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* Versions before 10.0.14393.7969 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* Versions before 10.0.17763.7136 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions before 10.0.20348.3453 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* Versions before 10.0.25398.1551 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* Versions before 10.0.26100.3775 Vulnerable ·Microsoft

Remediation

Microsoft 8 updates

  • KB5055547
    Security Update
    • Windows 10 for 32-bit Systems 10.0.10240.20978
    • Windows 10 for x64-based Systems 10.0.10240.20978
  • KB5055528
    Security Update
    • Windows 11 Version 22H2 for ARM64-based Systems 10.0.22621.5189
    • Windows 11 Version 22H2 for x64-based Systems 10.0.22621.5189
    • Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.5189
    • Windows 11 Version 23H2 for x64-based Systems 10.0.22631.5189
  • KB5055527
    Security Update
    • Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1551
Show 5 more Microsoft updates
  • KB5055526
    Security Update
    • Azure Stack HCI OS 22H2 10.0.20348.3328
    • Windows Server 2022 10.0.20348.3453
    • Windows Server 2022 (Server Core installation) 10.0.20348.3453
  • KB5055523
    Security Update
    • Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.3775
    • Windows 11 Version 24H2 for x64-based Systems 10.0.26100.3775
    • Windows Server 2025 10.0.26100.3775
    • Windows Server 2025 (Server Core installation) 10.0.26100.3775
  • KB5055521
    Security Update
    • Windows 10 Version 1607 for 32-bit Systems 10.0.14393.7969
    • Windows 10 Version 1607 for x64-based Systems 10.0.14393.7969
    • Windows Server 2016 10.0.14393.7969
    • Windows Server 2016 (Server Core installation) 10.0.14393.7969
  • KB5055519
    Security Update
    • Windows 10 Version 1809 for 32-bit Systems 10.0.17763.7136
    • Windows 10 Version 1809 for x64-based Systems 10.0.17763.7136
    • Windows Server 2019 10.0.17763.7136
    • Windows Server 2019 (Server Core installation) 10.0.17763.7136
  • KB5055518
    Security Update
    • Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.5737
    • Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.5737
    • Windows 10 Version 21H2 for x64-based Systems 10.0.19044.5737
    • Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.5737
    • Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.5737
    • Windows 10 Version 22H2 for x64-based Systems 10.0.19045.5737
    • Windows 11 version 21H2 for ARM64-based Systems 10.0.19044.5737
    • Windows 11 version 21H2 for x64-based Systems 10.0.19044.5737

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27491
  2. 2026-10-03 Alias added: GHSA-c8q9-g877-5qr3

References

Patch 1

  • TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-24062 Windows SMB Client Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24042 Internet Shortcut Files Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2024-32708 Windows Task Scheduler Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2024-29106 Windows MSHTML Platform Spoofing Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2024-19802 Windows MSHTML Platform Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
See all 1229 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences