CyberSecBulletin
CVE-2025-47827Exploited in the wildNVD status: Analyzed

IGEL OS Use of a Key Past its Expiration Date

Published Updated By the CyberSecBulletin desk

CVE-2025-47827 is a medium-severity improper verification of cryptographic signature vulnerability in Igel OS from Igel, with a CVSS 3.1 base score of 4.6 out of 10. It can be exploited with physical access to the device by an unauthenticated attacker, without any action from a user. The record lists version 11.01.100 as the first without the flaw, so updating Igel OS to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on October 14, 2025, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Update Igel OS to 11.01.100 or a later version.
  2. Update Windows 10 1507 to 10.0.10240.21161 or a later version.
  3. Update Windows 10 1607 to 10.0.14393.8519 or a later version.
  4. CISA's 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.
  5. Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
IgelIgel OSbefore 11.01.10011.01.100
MicrosoftWindows 10 1507before 10.0.10240.2116110.0.10240.21161
MicrosoftWindows 10 1607before 10.0.14393.851910.0.14393.8519
MicrosoftWindows 10 1809before 10.0.17763.791910.0.17763.7919
MicrosoftWindows 10 21h2before 10.0.19044.645610.0.19044.6456
MicrosoftWindows 10 22h2before 10.0.19045.645610.0.19045.6456
MicrosoftWindows 11 22h2before 10.0.22621.606010.0.22621.6060
MicrosoftWindows 11 23h2before 10.0.22631.606010.0.22631.6060
MicrosoftWindows 11 24h2before 10.0.26100.689910.0.26100.6899
MicrosoftWindows 11 25h2before 10.0.26200.689910.0.26200.6899
MicrosoftWindows Server 2012r2Not stated
MicrosoftWindows Server 2016before 10.0.14393.851910.0.14393.8519
MicrosoftWindows Server 2019before 10.0.17763.791910.0.17763.7919
MicrosoftWindows Server 2022before 10.0.20348.429410.0.20348.4294
MicrosoftWindows Server 2022 23h2before 10.0.25398.191310.0.25398.1913
MicrosoftWindows Server 2025before 10.0.26100.689910.0.26100.6899

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
PhysicalThe attacker must physically touch the device.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CISA (ADP).

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)

Timeline

  1. CVE record published.
  2. Added to CISA's Known Exploited Vulnerabilities catalogue.
  3. CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: partial).
  4. Deadline for US federal agencies to remediate, set by CISA.
  5. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Technical write-ups (may include proof of concept)

Other references

Recent Improper Verification of Cryptographic Signature vulnerabilities

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