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CVE-2021-41338— Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability

Quick assessment

Affected

Microsoft Windows 10 Version 1809

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows AppContainer是美国微软（Microsoft）公司的一种沙盒机制，用于控制 UWP 应用可以访问或不访问哪些资源。 Microsoft Windows AppContainer存在安全特征问题漏洞。以下产品和版本受到影响：Windows 10 Version 1909 for ARM64-based Systems,Windows 10 Version 21H1 for x64-based Systems,Windows 10 Version 21H1 for

CVSS 5.5 · Medium EPSS 3.30% · P88 Updated Feb 25, 2026

Possible ATT&CK Techniques 1 AI

T1562.004

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I. Basic Information for CVE-2021-41338

Vulnerability Information

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Vulnerability Title

Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft Windows AppContainer 安全特征问题特征问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Microsoft	Windows 10 Version 1809	10.0.0 ~ 10.0.17763.2237	`cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237::::::x86:`
Microsoft	Windows Server 2019	10.0.0 ~ 10.0.17763.2237	`cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2237:::::::*`
Microsoft	Windows Server 2019 (Server Core installation)	10.0.0 ~ 10.0.17763.2237	`cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2237:::::::*`
Microsoft	Windows 10 Version 1909	10.0.0 ~ 10.0.18363.1854	`cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1854::::::x86:`
Microsoft	Windows 10 Version 21H1	10.0.0 ~ 10.0.19043.1288	`cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1288::::::x64:`
Microsoft	Windows Server 2022	10.0.0 ~ 10.0.20348.288	`cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.288:::::::*`
Microsoft	Windows 10 Version 2004	10.0.0 ~ 10.0.19041.1288	`cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1288::::::x64:`
Microsoft	Windows Server version 2004	10.0.0 ~ 10.0.19041.1288	`cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1288:::::::*`
Microsoft	Windows 10 Version 20H2	10.0.0 ~ 10.0.19042.1288	`cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1288::::::x86:`
Microsoft	Windows Server version 20H2	10.0.0 ~ 10.0.19042.1288	`cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1288:::::::*`
Microsoft	Windows 11 version 21H2	10.0.0 ~ 10.0.22000.258	`cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.258::::::x64:`
Microsoft	Windows 10 Version 1507	10.0.0 ~ 10.0.10240.19086	`cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19086::::::x86:`
Microsoft	Windows 10 Version 1607	10.0.0 ~ 10.0.14393.4704	`cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4704::::::x86:`
Microsoft	Windows Server 2016	10.0.0 ~ 10.0.14393.4704	`cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4704:::::::*`
Microsoft	Windows Server 2016 (Server Core installation)	10.0.0 ~ 10.0.14393.4704	`cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4704:::::::*`

II. Public POCs for CVE-2021-41338

#	POC Description	Source Link	Shenlong Link
1	Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability CVE-2021-41338 Security Vulnerability Released: Oct 12, 2021 Assigning CNA: Microsoft MITRE CVE-2021-41338 CVSS:3.1 5.5 / 5.0 Attack Vector Local Attack Complexity Low Privileges Required Low User Interaction None Scope Unchanged Confidentiality High Integrity None Availability None Exploit Code Maturity Proof-of-Concept Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Yes No Exploitation Less Likely	https://github.com/Mario-Kart-Felix/firewall-cve	POC Details

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2021-41338

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Vendor Advisories for CVE-2021-41338 (1)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41338 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2021-41338

Same Patch Batch · Microsoft · 2021-10-13 · 71 CVEs total

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CVE-2021-36970	8.8 HIGH	Windows Print Spooler Spoofing Vulnerability
CVE-2021-41344	8.1 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-40487	8.1 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-41348	8.0 HIGH	Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2021-40461	8.0 HIGH	Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-38672	8.0 HIGH	Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-40464	8.0 HIGH	Windows Nearby Sharing Elevation of Privilege Vulnerability
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CVE-2021-40462	7.8 HIGH	Windows Media Foundation Dolby Digital Atmos Decoders Remote Code Execution Vulnerability
CVE-2021-40449	7.8 HIGH	Win32k Elevation of Privilege Vulnerability
CVE-2021-40473	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40474	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40477	7.8 HIGH	Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-40479	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40480	7.8 HIGH	Microsoft Office Visio Remote Code Execution Vulnerability
CVE-2021-40485	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40486	7.8 HIGH	Microsoft Word Remote Code Execution Vulnerability
CVE-2021-40478	7.8 HIGH	Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-40467	7.8 HIGH	Windows Common Log File System Driver Elevation of Privilege Vulnerability

Showing top 20 of 71 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1809

Same vendor: Microsoft

V. Comments for CVE-2021-41338

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2021-41338— Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2021-41338

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2021-41338

III. Intelligence Information for CVE-2021-41338

Vendor Advisories for CVE-2021-41338 (1)

Same Patch Batch · Microsoft · 2021-10-13 · 71 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2021-41338

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