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TI-2021-17516 Aliases CVE-2021-40469GHSA-g6f2-f38r-23wj

Windows DNS Server Remote Code Execution Vulnerability

Priority MEDIUM 42Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Windows DNS Server Remote Code Execution Vulnerability

Why it matters now

EPSS 0.07576 94th percentileScored 2026-11-07
Fix Fixed Windows Server 2019 (Microsoft): 10.0.17763.2237Windows Server 2019 (Server Core installation) (Microsoft): 10.0.17763.2237+14 more products

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows Server 201910.0.0 to before 10.0.17763.223710.0.17763.2237Patch availableCNA
MicrosoftWindows Server 2019 (Server Core installation)10.0.0 to before 10.0.17763.223710.0.17763.2237Patch availableCNA
MicrosoftWindows Server 202210.0.0 to before 10.0.20348.28810.0.20348.288Patch availableCNA
MicrosoftWindows Server version 200410.0.0 to before 10.0.19041.128810.0.19041.1288Patch availableCNA
MicrosoftWindows Server version 20H210.0.0 to before 10.0.19042.128810.0.19042.1288Patch availableCNA
MicrosoftWindows Server 201610.0.0 to before 10.0.14393.470410.0.14393.4704Patch availableCNA
MicrosoftWindows Server 2016 (Server Core installation)10.0.0 to before 10.0.14393.470410.0.14393.4704Patch availableCNA
MicrosoftWindows Server 2008 Service Pack 26.0.0 to before 6.0.6003.212516.0.6003.21251Patch availableCNA
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)6.0.0 to before 6.0.6003.212516.0.6003.21251Patch availableCNA
MicrosoftWindows Server 2008 Service Pack 26.0.0 to before 6.0.6003.212516.0.6003.21251Patch availableCNA
MicrosoftWindows Server 2008 R2 Service Pack 16.1.0 to before 6.1.7601.257406.1.7601.25740Patch availableCNA
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)6.0.0 to before 6.1.7601.257406.1.7601.25740Patch availableCNA
MicrosoftWindows Server 20126.2.0 to before 6.2.9200.234906.2.9200.23490Patch availableCNA
MicrosoftWindows Server 2012 (Server Core installation)6.2.0 to before 6.2.9200.234906.2.9200.23490Patch availableCNA
MicrosoftWindows Server 2012 R26.3.0 to before 6.3.9600.201446.3.9600.20144Patch availableCNA
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.0 to before 6.3.9600.201446.3.9600.20144Patch availableCNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2237 Fixed in 10.0.17763.2237 Patch available CNA
  • Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2237 Fixed in 10.0.17763.2237 Patch available CNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.0 to before 10.0.20348.288 Fixed in 10.0.20348.288 Patch available CNA
  • Windows Server version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1288 Fixed in 10.0.19041.1288 Patch available CNA
  • Windows Server version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1288 Fixed in 10.0.19042.1288 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4704 Fixed in 10.0.14393.4704 Patch available CNA
  • Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4704 Fixed in 10.0.14393.4704 Patch available CNA
  • Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21251 Fixed in 6.0.6003.21251 Patch available CNA
  • Windows Server 2008 Service Pack 2 (Server Core installation) VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21251 Fixed in 6.0.6003.21251 Patch available CNA
  • Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21251 Fixed in 6.0.6003.21251 Patch available CNA
  • Windows Server 2008 R2 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25740 Fixed in 6.1.7601.25740 Patch available CNA
  • Windows Server 2008 R2 Service Pack 1 (Server Core installation) VendorMicrosoft Affected 6.0.0 to before 6.1.7601.25740 Fixed in 6.1.7601.25740 Patch available CNA
  • Windows Server 2012 VendorMicrosoft Affected 6.2.0 to before 6.2.9200.23490 Fixed in 6.2.9200.23490 Patch available CNA
  • Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.0 to before 6.2.9200.23490 Fixed in 6.2.9200.23490 Patch available CNA
  • Windows Server 2012 R2 VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20144 Fixed in 6.3.9600.20144 Patch available CNA
  • Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20144 Fixed in 6.3.9600.20144 Patch available CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*r2 sp1VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*r2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*20h2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*2004VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:* Versions 20h2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:* Versions 2004 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

  • Fix · CNA Windows Server 2019 (Microsoft) Fixed in 10.0.17763.2237
  • Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in 10.0.17763.2237
  • Fix · CNA Windows Server 2022 (Microsoft) Fixed in 10.0.20348.288
  • Fix · CNA Windows Server version 2004 (Microsoft) Fixed in 10.0.19041.1288
  • Fix · CNA Windows Server version 20H2 (Microsoft) Fixed in 10.0.19042.1288
  • Fix · CNA Windows Server 2016 (Microsoft) Fixed in 10.0.14393.4704
  • Fix · CNA Windows Server 2016 (Server Core installation) (Microsoft) Fixed in 10.0.14393.4704
  • Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in 6.0.6003.21251
  • Fix · CNA Windows Server 2008 Service Pack 2 (Server Core installation) (Microsoft) Fixed in 6.0.6003.21251
  • Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in 6.0.6003.21251
  • Fix · CNA Windows Server 2008 R2 Service Pack 1 (Microsoft) Fixed in 6.1.7601.25740
  • Fix · CNA Windows Server 2008 R2 Service Pack 1 (Server Core installation) (Microsoft) Fixed in 6.1.7601.25740
  • Fix · CNA Windows Server 2012 (Microsoft) Fixed in 6.2.9200.23490
  • Fix · CNA Windows Server 2012 (Server Core installation) (Microsoft) Fixed in 6.2.9200.23490
  • Fix · CNA Windows Server 2012 R2 (Microsoft) Fixed in 6.3.9600.20144
  • Fix · CNA Windows Server 2012 R2 (Server Core installation) (Microsoft) Fixed in 6.3.9600.20144

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40469
  2. 2026-10-03 Alias added: GHSA-g6f2-f38r-23wj

References

Patch 1

  • TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01310 Improper input validation in Microsoft Windows Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-00485 Use after free in Microsoft Windows KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-01465 HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1… KEVCVSS 3.1CRITICAL 9.8
  • TI-2008-04072 The Server service in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and… KEVCVSS 3.1CRITICAL 9.8
See all 3551 →

Sources

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