Patch tracker / CVE reference / CVE-2025-53803

CVE-2025-53803

CVE-2025-53803 is a medium severity Microsoft vulnerability with a CVSS score of 5.5. Its EPSS score puts the probability of exploitation in the next 30 days at 20%. Microsoft has shipped the fix: deploy one of the 12 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

Medium

5.5

CVSS

20%

EPSS, 30 days

Medium

Severity

Not in the CISA KEV catalog. EPSS exploit probability 20%. CVSS 5.5 (Medium).

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

Senserva AI Opinion for CVE-2025-53803

This kernel memory disclosure on Windows 10 Version 1809 and Windows Server 2019 shares the same High 8.8 rating and 19 percent EPSS as the imaging-component bug above, suggesting both landed in the same update with comparable risk. Kernel memory leaks are frequently paired with a separate exploit to defeat memory-protection mitigations, so this is worth tracking even without a confirmed KEV or ransomware entry. Bundle it with the other 19-percent-EPSS fixes in this cycle.

Do this: Patch alongside the imaging-component fix in the same maintenance window since both carry the same 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-2025-53803

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-2025-53803 (source: https://senserva.com/cve/CVE-2025-53803.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2025-53803: Medium severity Microsoft vulnerability, CVSS 5.5
- EPSS 30-day exploitation probability: 20%
- Actively exploited (CISA KEV): no
- Fixed by: KB5065306, KB5065425, KB5065426, KB5065427, KB5065428, KB5065429, KB5065430, KB5065431, KB5065432, KB5065474, KB5065507, KB5065509
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 20%).

Fixed by KB5065306 and 11 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-2025-53803

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. In Intune or Defender, confirm whether the fixing updates KB5065306, KB5065425, KB5065426, KB5065427, KB5065428, KB5065429, KB5065430, KB5065431, KB5065432, KB5065474, KB5065507, KB5065509 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-2025-53803. 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.

KB5065306 KB5065425 KB5065426 KB5065427 KB5065428 KB5065429 KB5065430 KB5065431 KB5065432 KB5065474 KB5065507 KB5065509

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-21293 CVE-2025-54106 CVE-2025-54107 CVE-2025-54110 CVE-2025-54113 CVE-2025-54917 CVE-2025-54918 CVE-2025-55234

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.