Patch tracker / CVE reference / CVE-2024-21907

CVE-2024-21907

CVE-2024-21907 is a high severity Microsoft vulnerability with a CVSS score of 8.8. Its EPSS score puts the probability of exploitation in the next 30 days at 33%. Microsoft has shipped the fix: deploy one of the 6 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

8.8

CVSS

33%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 33%. CVSS 8.8 (High).

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

Senserva AI Opinion for CVE-2024-21907

CVE-2024-21907 is a High severity Microsoft flaw rated CVSS 8.8, meaning it combines meaningful impact with a relatively low attack barrier. The 33 percent EPSS score is notably elevated for something not yet in CISA KEV, suggesting researchers see a realistic path to exploitation even though no confirmed attacks or ransomware use exist today. That gap between predicted risk and confirmed abuse is the window you want to patch inside.

Do this: Identify all Microsoft assets affected by CVE-2024-21907 and schedule patching this week rather than waiting for KEV confirmation.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2024-21907

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-2024-21907 (source: https://senserva.com/cve/CVE-2024-21907.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2024-21907: High severity Microsoft vulnerability, CVSS 8.8
- EPSS 30-day exploitation probability: 33%
- Actively exploited (CISA KEV): no
- Fixed by: KB5065222, KB5065223, KB5065224, KB5065225, KB5065226, KB5065227
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 33%).

Fixed by KB5065222 and 5 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-2024-21907

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 KB5065222, KB5065223, KB5065224, KB5065225, KB5065226, KB5065227 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-2024-21907. 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.

KB5065222 KB5065223 KB5065224 KB5065225 KB5065226 KB5065227

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-55227 CVE-2025-47997

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.