# What is CVE-2025-47827?

> CVE-2025-47827 is a medium-severity flaw (CVSS 4.6) in Igel OS, published on 5 June 2025. It is on the list of flaws known to be exploited, so criminals are already using it. The latest forecast puts its chance of use in the next 30 days at 4.9%. If you run an affected version, patch it first.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2025-47827

## At a glance

- **Verdict:** Fix this now. Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.
- **Precursor Intelligence risk score:** 74 out of 100 (High); action: Emergency patch. Kept up to date as the evidence changes.
- **Severity:** Medium (CVSS 4.6 out of 10)
- **Known to be exploited:** Yes, it is on the government list of flaws known to be exploited
- **Chance of use in the next 30 days:** 4.9% (latest exploit-likelihood forecast)
- **Published:** 5 June 2025
- **Record last updated:** 15 October 2025
- **Main product:** Igel OS
- **Affected products:** 16

## What is CVE-2025-47827? In plain terms

An attacker has to be physically at the device without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### The 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.

### What kind of flaw is it?

- CWE-347: Improper Verification of Cryptographic Signature

### How an attack on it works

- Where an attacker can be: Physically at the device
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can take it offline

Severity vector: `CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

## Is CVE-2025-47827 being exploited? Yes

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 4.9%.

Exploit likelihood over the last 7 days: 4.9%, 4.9%, 4.9%, 4.9%, 4.9%, 4.9%, 4.9%.

### Timeline

- 5 June 2025: Published
- 15 October 2025: Added to the known-exploited list
- 15 October 2025: Record last updated
- 19 November 2025: Exploit likelihood jumped
- 22 November 2025: Exploit likelihood fell

### How Precursor Intelligence ranks it

CVE-2025-47827 scores **74 out of 100 (High)**, with the action "Emergency patch".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2025-47827?

The published record lists 16 products. Versions are as published: "before 11.01.100" means every version up to, but not including, 11.01.100.

- [Igel OS](https://www.precursorintelligence.com/product/igel/igel_os) by [Igel](https://www.precursorintelligence.com/vendors/igel) (Operating system): before 11.01.100
- [Windows 10 1507](https://www.precursorintelligence.com/product/microsoft/windows_10_1507) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.10240.21161
- [Windows 10 1607](https://www.precursorintelligence.com/product/microsoft/windows_10_1607) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.14393.8519
- [Windows 10 1809](https://www.precursorintelligence.com/product/microsoft/windows_10_1809) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.17763.7919
- [Windows 10 21H2](https://www.precursorintelligence.com/product/microsoft/windows_10_21h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.19044.6456
- [Windows 10 22H2](https://www.precursorintelligence.com/product/microsoft/windows_10_22h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.19045.6456
- [Windows 11 22H2](https://www.precursorintelligence.com/product/microsoft/windows_11_22h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.22621.6060
- [Windows 11 23H2](https://www.precursorintelligence.com/product/microsoft/windows_11_23h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.22631.6060
- [Windows 11 24H2](https://www.precursorintelligence.com/product/microsoft/windows_11_24h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.26100.6899
- [Windows 11 25H2](https://www.precursorintelligence.com/product/microsoft/windows_11_25h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.26200.6899
- [Windows Server 2012](https://www.precursorintelligence.com/product/microsoft/windows_server_2012) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): r2
- [Windows Server 2016](https://www.precursorintelligence.com/product/microsoft/windows_server_2016) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.14393.8519
- [Windows Server 2019](https://www.precursorintelligence.com/product/microsoft/windows_server_2019) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.17763.7919
- [Windows Server 2022](https://www.precursorintelligence.com/product/microsoft/windows_server_2022) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.20348.4294
- [Windows Server 2022 23H2](https://www.precursorintelligence.com/product/microsoft/windows_server_2022_23h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.25398.1913
- [Windows Server 2025](https://www.precursorintelligence.com/product/microsoft/windows_server_2025) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.26100.6899

## How do I fix CVE-2025-47827?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the latest update from the vendor. The references list where the vendor has published details.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Check it wasn’t used before you patched.** Because criminals are already using this flaw, look for signs of a break-in on affected systems using the vendor’s guidance.

### References

- [github.com](https://github.com/Zedeldi/CVE-2025-47827) (Exploit, Third-party advisory)
- [github.com](https://github.com/Zedeldi/igelfs) (Product)
- [msrc.microsoft.com](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-47827) (Third-party advisory)

## Questions

### What is CVE-2025-47827?

CVE-2025-47827 is a medium-severity flaw in Igel OS, published on 5 June 2025. An attacker has to be physically at the device without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### How serious is CVE-2025-47827?

It scores 4.6 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2025-47827 is 74 out of 100, which is High. Its action is "Emergency patch". Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.

### Is CVE-2025-47827 being exploited?

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 4.9%.

### Which versions does CVE-2025-47827 affect?

For Igel OS: before 11.01.100. The record lists 16 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2025-47827?

Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. Because criminals are already using it, also check affected systems for signs of a break-in.

## Does CVE-2025-47827 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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