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TI-2021-18163 Aliases CVE-2021-41338GHSA-6738-qwp3-v34h

Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability

Priority LOW 31Published · Updated

Key facts

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

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

Summary

Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03299 88th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1809 (Microsoft): 10.0.17763.2237Windows Server 2019 (Microsoft): 10.0.17763.2237+13 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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 180910.0.0 to before 10.0.17763.223710.0.17763.2237Patch availableCNA
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 10 Version 190910.0.0 to before 10.0.18363.185410.0.18363.1854Patch availableCNA
MicrosoftWindows 10 Version 21H110.0.0 to before 10.0.19043.128810.0.19043.1288Patch availableCNA
MicrosoftWindows Server 202210.0.0 to before 10.0.20348.28810.0.20348.288Patch availableCNA
MicrosoftWindows 10 Version 200410.0.0 to before 10.0.19041.128810.0.19041.1288Patch availableCNA
MicrosoftWindows Server version 200410.0.0 to before 10.0.19041.128810.0.19041.1288Patch availableCNA
MicrosoftWindows 10 Version 20H210.0.0 to before 10.0.19042.128810.0.19042.1288Patch availableCNA
MicrosoftWindows Server version 20H210.0.0 to before 10.0.19042.128810.0.19042.1288Patch availableCNA
MicrosoftWindows 11 version 21H210.0.0 to before 10.0.22000.25810.0.22000.258Patch availableCNA
MicrosoftWindows 10 Version 150710.0.0 to before 10.0.10240.1908610.0.10240.19086Patch availableCNA
MicrosoftWindows 10 Version 160710.0.0 to before 10.0.14393.470410.0.14393.4704Patch 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
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2237 Fixed in 10.0.17763.2237 Patch available CNA
  • 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 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before 10.0.18363.1854 Fixed in 10.0.18363.1854 Patch available CNA
  • Windows 10 Version 21H1 VendorMicrosoft Affected 10.0.0 to before 10.0.19043.1288 Fixed in 10.0.19043.1288 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 10 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 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1288 Fixed in 10.0.19041.1288 Patch available CNA
  • Windows 10 Version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1288 Fixed in 10.0.19042.1288 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 11 version 21H2 VendorMicrosoft Affected 10.0.0 to before 10.0.22000.258 Fixed in 10.0.22000.258 Patch available CNA
  • Windows 10 Version 1507 VendorMicrosoft Affected 10.0.0 to before 10.0.10240.19086 Fixed in 10.0.10240.19086 Patch available CNA
  • Windows 10 Version 1607 VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4704 Fixed in 10.0.14393.4704 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

CPE configurations NVD · 14

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*20h2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:*:*21h1VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*1607VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*1809VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*1909VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*2004VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:arm64:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:* Versions 20h2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:*:* Versions 21h1 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* Versions 1607 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* Versions 1809 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* Versions 1909 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:* Versions 2004 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:arm64:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Show 4 more CPE
CPEVersionsRoleVendor
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_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 10 Version 1809 (Microsoft) Fixed in 10.0.17763.2237
  • 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 10 Version 1909 (Microsoft) Fixed in 10.0.18363.1854
  • Fix · CNA Windows 10 Version 21H1 (Microsoft) Fixed in 10.0.19043.1288
  • Fix · CNA Windows Server 2022 (Microsoft) Fixed in 10.0.20348.288
  • Fix · CNA Windows 10 Version 2004 (Microsoft) Fixed in 10.0.19041.1288
  • Fix · CNA Windows Server version 2004 (Microsoft) Fixed in 10.0.19041.1288
  • Fix · CNA Windows 10 Version 20H2 (Microsoft) Fixed in 10.0.19042.1288
  • Fix · CNA Windows Server version 20H2 (Microsoft) Fixed in 10.0.19042.1288
  • Fix · CNA Windows 11 version 21H2 (Microsoft) Fixed in 10.0.22000.258
  • Fix · CNA Windows 10 Version 1507 (Microsoft) Fixed in 10.0.10240.19086
  • Fix · CNA Windows 10 Version 1607 (Microsoft) Fixed in 10.0.14393.4704
  • 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

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41338
  2. 2026-10-03 Alias added: GHSA-6738-qwp3-v34h

References

Patch 1

  • TI-2015-02132 Buffer underflow in atmfd.dll in the Windows Adobe Type Manager Library in Microsoft… KEVCVSS 3.1HIGH 8.8
  • TI-2022-10056 Remote Procedure Call Runtime Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-06273 HTTP Protocol Stack Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2019-00906 Remote Desktop Services Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-15533 Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2015-01587 Mount Manager in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows… KEVCVSS 3.1MEDIUM 6.6
See all 2973 →

Sources

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