Patch tracker / CVE reference / CVE-2025-21298

CVE-2025-21298

CVE-2025-21298 is a Microsoft vulnerability that Microsoft rates Critical, with a CVSS score of 9.8 (Critical). Its EPSS score puts the probability of exploitation in the next 30 days at 74%. Microsoft has shipped the fix: deploy one of the 14 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.

Microsoft rates it Critical. CVSS 9.8 (Critical). Fixed by 14 Microsoft security updates.

Senserva AI read on CVE-2025-21298Official patches for CVE-2025-21298Change historyAdmin questions

Risk summary

Critical
9.8
CVSS v3
74%
EPSS, 30 days
Critical
Severity

Not in the CISA KEV catalog. EPSS exploit probability 74%. CVSS 9.8 (Critical).

This CVE is among the top 5% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2025-21298

An 81% EPSS makes this Windows OLE Remote Code Execution flaw one of the most likely-to-be-exploited unexploited bugs on the list. OLE bugs in this class have historically been triggered by crafted content in email, sometimes in preview without a click, which is what makes a Critical Severity (CVSS 9.8) rating here so uncomfortable. Windows 10 1809 and Windows Server 2019 carry the flaw.

Do this: Expedite this patch to all 1809 and Server 2019 endpoints and consider configuring mail clients to display messages in plain text until coverage is complete.

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

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 74%).
Fixed by KB5049981 and 13 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.
Senserva AI Opinion and rich prompt for CVE-2025-21298

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

Official patch(es) for CVE-2025-21298

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5049981, KB5049983, KB5049984, KB5049993, KB5050004, KB5050006, KB5050008, KB5050009, KB5050013, KB5050021, KB5050048, KB5050049, KB5050061, KB5050063 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-2025-21298. 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.

KB5049981KB5049983KB5049984KB5049993KB5050004KB5050006KB5050008KB5050009KB5050013KB5050021KB5050048KB5050049KB5050061KB5050063

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-21333CVE-2025-21334CVE-2025-21335CVE-2025-21307CVE-2025-21311CVE-2025-21176CVE-2025-21223CVE-2025-21233
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

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

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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