# CVE-2025-47827: MITRE CVE-2025-47827: Secure Boot bypass in IGEL OS before 11 CVE-2025-47827 is fixed in 33 products on 1 platform, first by KB5066836, released October 14, 2025. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on October 14, 2025. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/cve/CVE-2025-47827 - Priority: Patch now - CVSS: 4.6 (Important) - EPSS: 0.0515 - CISA KEV: listed Oct 14, 2025, federal due date Nov 4, 2025 - Exploited (vendor report): yes - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Detected - Published: Oct 14, 2025 - Weakness: Use of a Key Past its Expiration Date - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47827 ## Description

In IGEL OS before 11, Secure Boot can be bypassed because the igel-flash-driver module improperly verifies a cryptographic signature. Ultimately, a crafted root filesystem can be mounted from an unverified SquashFS image.

MITRE created this CVE on their behalf. The documented Windows updates incorporate updates in IGEL OS which address this vulnerability. Please see Security Update Guide Supports CVEs Assigned by Industry Partners for more information.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 21H2 for 32-bit Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 21H2 for ARM64-based Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 21H2 for x64-based Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 22H2 for 32-bit Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 22H2 for ARM64-based Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 22H2 for x64-based Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 for 32-bit Systems | 10240.21161 | [KB5066837](https://patchblox.com/security/data/fix/microsoft/kb5066837.md) | Oct 14, 2025 | | Microsoft | Windows 10 for x64-based Systems | 10240.21161 | [KB5066837](https://patchblox.com/security/data/fix/microsoft/kb5066837.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 22H2 for ARM64-based Systems | | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 22H2 for x64-based Systems | | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 23H2 for ARM64-based Systems | | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 23H2 for x64-based Systems | | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 24H2 for x64-based Systems | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 25H2 for ARM64-based Systems | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 25H2 for x64-based Systems | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 | | [KB5066875](https://patchblox.com/security/data/fix/microsoft/kb5066875.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB5066875](https://patchblox.com/security/data/fix/microsoft/kb5066875.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 R2 | | [KB5066873](https://patchblox.com/security/data/fix/microsoft/kb5066873.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB5066873](https://patchblox.com/security/data/fix/microsoft/kb5066873.md) | Oct 14, 2025 | | Microsoft | Windows Server 2016 | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows Server 2019 | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows Server 2022 | 20348.4294 | [KB5066782](https://patchblox.com/security/data/fix/microsoft/kb5066782.md) | Oct 14, 2025 | | Microsoft | Windows Server 2022 (Server Core installation) | 20348.4294 | [KB5066782](https://patchblox.com/security/data/fix/microsoft/kb5066782.md) | Oct 14, 2025 | | Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1913 | [KB5066780](https://patchblox.com/security/data/fix/microsoft/kb5066780.md) | Oct 14, 2025 | | Microsoft | Windows Server 2025 | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows Server 2025 (Server Core installation) | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | --- Data as of 2026-11-08T19:12:23Z UTC. 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