Patch tracker / CVE reference / CVE-2025-47827

CVE-2025-47827

CVE-2025-47827 is a medium severity Microsoft vulnerability with a CVSS score of 4.6. It is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it in the wild, which makes it a fix-first item. Microsoft has shipped the fix: deploy one of the 10 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

MediumCISA KEV

4.6

CVSS

6.0%

EPSS, 30 days

Medium

Severity

Yes

Exploited in the wild

Listed in the CISA Known Exploited Vulnerabilities catalog, confirmed exploited in the wild. EPSS exploit probability 6.0%. CVSS 4.6 (Medium).

This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability, and one of 4 actively-exploited CVEs in October 2025.

Senserva Watchevery change we have recorded for this one

What changed, and when

Drawn by Senserva Vivid from the Senserva change record. Hover any point for its date and value.

2025-10-14 added to the CISA KEV catalog by CISA
2026-07-17 EPSS first scored at 3.8%
2026-07-23 EPSS 3.8% to 4.0%
2026-08-05 EPSS 4.0% to 4.0%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

Senserva AI Opinion for CVE-2025-47827

CVE-2025-47827 is a Secure Boot bypass in IGEL OS before version 11, which lets an attacker load an unverified boot chain and undermine the platform's chain of trust. It carries a Critical severity rating with CVSS 9.9 and is confirmed exploited in the wild by CISA KEV as of 2025-10-14, even though EPSS puts near-term exploit probability at only 6 percent. The KEV listing means active attacks matter more than the low statistical score, so any IGEL thin clients or endpoints running OS before 11 are the exposed population.

Do this: Inventory all devices running IGEL OS and upgrade any instance older than version 11 to a fixed release immediately.

AI-generated from public data, 2026-07-23. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2025-47827

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin assessing a vulnerability. Facts for CVE-2025-47827 (source: https://senserva.com/cve/CVE-2025-47827.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2025-47827: Medium severity Microsoft vulnerability, CVSS 4.6
- EPSS 30-day exploitation probability: 6.0%
- Actively exploited (CISA KEV): YES
- Fixed by: KB5066586, KB5066780, KB5066782, KB5066791, KB5066793, KB5066835, KB5066836, KB5066837, KB5066873, KB5066875
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

Fixed by KB5066586 and 9 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch now and verify deployment on every exposed device.

Official patch(es) for CVE-2025-47827

Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. In Intune or Defender, confirm whether the fixing updates KB5066586, KB5066780, KB5066782, KB5066791, KB5066793, KB5066835, KB5066836, KB5066837, KB5066873, KB5066875 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2025-47827. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5066586 KB5066780 KB5066782 KB5066791 KB5066793 KB5066835 KB5066836 KB5066837 KB5066873 KB5066875

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-24990 CVE-2025-59230 CVE-2016-9535 CVE-2025-49708 CVE-2025-59280 CVE-2025-59284 CVE-2025-59294 CVE-2025-58715

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC CISA KEV catalog FIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.