Patch tracker / CVE reference / CVE-2025-55229

CVE-2025-55229

CVE-2025-55229 is a medium severity Microsoft vulnerability with a CVSS score of 5.3. Its EPSS score puts the probability of exploitation in the next 30 days at 61%. Microsoft has shipped the fix: deploy one of the 9 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

Medium

5.3

CVSS

61%

EPSS, 30 days

Medium

Severity

Not in the CISA KEV catalog. EPSS exploit probability 61%. CVSS 5.3 (Medium).

This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2025-55229

Windows Certificate spoofing, High severity at CVSS 8.8, affects Windows 10 Version 1809 in both 32-bit and x64 flavors plus Windows Server 2019. Certificate spoofing undermines the trust checks that let users and software tell a legitimate signed file from a forged one, and an EPSS of 58 percent means real-world exploitation is a live possibility, not a theoretical one.

Do this: Move this update ahead of routine patching on all Windows 10 1809 and Server 2019 systems given the elevated EPSS.

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

Senserva AI Opinion and rich prompt for CVE-2025-55229

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-2025-55229 (source: https://senserva.com/cve/CVE-2025-55229.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2025-55229: Medium severity Microsoft vulnerability, CVSS 5.3
- EPSS 30-day exploitation probability: 61%
- Actively exploited (CISA KEV): no
- Fixed by: KB5058379, KB5058383, KB5058384, KB5058385, KB5058387, KB5058392, KB5058405, KB5058411, KB5058500
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 this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 61%).

Fixed by KB5058379 and 8 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2025-55229

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5058379, KB5058383, KB5058384, KB5058385, KB5058387, KB5058392, KB5058405, KB5058411, KB5058500 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-2025-55229. 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.

KB5058379 KB5058383 KB5058384 KB5058385 KB5058387 KB5058392 KB5058405 KB5058411 KB5058500

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-30400 CVE-2025-32701 CVE-2025-32706 CVE-2025-32709 CVE-2025-30397 CVE-2025-29839 CVE-2025-29840 CVE-2025-29962

Authoritative references

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

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