IGEL OS Use of a Key Past its Expiration Date Vulnerability
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.
What happened
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.
CISA lists it as exploited, added 14 Oct 2025.
Does it affect you
Names Microsoft Windows Server. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
Affected, as published to NVD
- ms-winserver
- Microsoft Windows Server: everything below 10.0.14393.8519
The record
- NVD status
- Analyzed
- Published
- 05 Jun 2025, last modified 17 Jun 2026 (NVD)
- Severity
- CVSS 3.1 base score 4.6, Medium — computed here from the vector; NVD states 4.6.
- Vector
- CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness
- CWE-347 Improper Verification of Cryptographic Signature (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 14 Oct 2025; federal remediation due 04 Nov 2025. CISA entry
- Exploit probability
- EPSS 4.9%, 92nd percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- IGEL · IGEL OS (CISA)
References on the NVD record
- github.com/Zedeldi/CVE-2025-47827ExploitThird Party Advisory
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-47827Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-47827US Government Resource
- github.com/Zedeldi/igelfsProduct
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.