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CVE-2025-47827

MEDIUM
4.6
CVSS Score
Published: June 5, 2025 at 12:00 AM UTC
Updated: June 17, 2026 at 09:28 AM UTC
17 products affected across 2 vendorsWindows Server 2016Windows Server 2019Windows Server 2012

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Severity
MEDIUM4.6
Exploitation
CISA KEV
Exploit prediction
EPSS 5%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score4.9%

EPSS (Exploit Prediction Scoring System) estimates a 4.9% chance this CVE is exploited in the wild within the next 30 days — higher than 92% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

IGEL OS contains a use of a key past its expiration date vulnerability that allows for Secure Boot bypass. The igel-flash-driver module improperly verifies a cryptographic signature. Ultimately, a crafted root filesystem can be mounted from an unverified SquashFS image.

Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Unknown
Added to KEV
Oct 14, 2025
Remediation Due
Nov 4, 2025
356 days overdue
Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-47827
https://nvd.nist.gov/vuln/detail/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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IGEL OS· Igel
95%
v < 11.01.100
Windows 10 1507· Microsoft
95%
v < 10.0.10240.21161
Windows 10 1607· Microsoft
95%
v < 10.0.14393.8519
Windows 10 1809· Microsoft
95%
v < 10.0.17763.7919
Windows 10 21H2· Microsoft
95%
v < 10.0.19044.6456
Windows 10 22H2· Microsoft
95%
v < 10.0.19045.6456
Windows 11 22H2· Microsoft
95%
v < 10.0.22621.6060
Windows 11 23H2· Microsoft
95%
v < 10.0.22631.6060
Windows 11 24H2· Microsoft
95%
v < 10.0.26100.6899
Windows 11 25H2· Microsoft
95%
v < 10.0.26200.6899

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

ExploitThird Party Advisory
Source: [email protected]
https://github.com/Zedeldi/CVE-2025-47827
Product
Source: [email protected]
https://github.com/Zedeldi/igelfs
Third Party Advisory
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-47827
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-47827

SSVC — Action Prioritization

SSVCActiveNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.6MEDIUMCISA-ADP
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-347

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