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CVE-2025-47827

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in IGEL OS. For every flaw being used in attacks, see Exploited flaws.

CVE-2025-47827 is a security flaw in IGEL OS. Attackers are using a flaw in IGEL OS. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 14 Oct 2025.[1]

IGEL OS is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. IGEL has published a fix or advice.

Description

CISA calls it an OS use of a key past its expiration date in IGEL IGEL OS. In its words: “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.”[1]

The underlying weakness is CWE-324, in MITRE’s list of common software weaknesses.[2]

It scores 4.6 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by the organisation that published the CVE using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; IGEL’s advisory has them[3]. CISA names the product as IGEL IGEL OS.

Most families won’t have IGEL OS; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 14 Oct 2025, 131 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 4 Nov 2025 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 5%. That’s in the top 8% of the flaws it scores.[4]

CISA assesses it as not automatable: each attack takes some work.

CISA doesn’t say who was attacked, or how.

Fix

IGEL has published a fix or advice.[3] 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.”[1]

  1. Check whether you use it.IGEL OS is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 4 Nov 2025 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 4.6.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 5%.[4]

See also

Added the same day

  • CVE-2025-59230, Microsoft Windows: improper access control ·
  • CVE-2025-24990, Microsoft Windows: untrusted pointer dereference ·
  • CVE-2016-7836, SKYSEA Client View: improper authentication ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “IGEL OS Use of a Key Past its Expiration Date Vulnerability”. Known Exploited Vulnerabilities Catalog, added 14 Oct 2025.
  2. ^ National Institute of Standards and Technology. “CVE-2025-47827 Detail”. National Vulnerability Database, published 5 Jun 2025.
  3. ^ IGEL. Advisories and fixes: msrc.microsoft.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.049, percentile 92.1, 31 Oct 2026.
  5. CVE Program. “CVE-2025-47827”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.