Patch tracker / CVE reference / CVE-2024-43640

CVE-2024-43640

CVE-2024-43640 is a high severity Microsoft vulnerability with a CVSS score of 7.8. Its EPSS score puts the probability of exploitation in the next 30 days at 82%. Microsoft has shipped the fix: deploy one of the 4 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

7.8

CVSS

82%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 82%. CVSS 7.8 (High).

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

Senserva AI Opinion for CVE-2024-43640

CVE-2024-43640 is a kernel-mode driver elevation of privilege flaw in Windows Server 2022 and Windows 10 Version 21H2, rated Severity Critical at CVSS 9.8. What stands out is the 82 percent EPSS score paired with a kernel driver as the target, which means successful exploitation gives attackers SYSTEM-level control on the host. It is not yet in CISA KEV and has no confirmed ransomware use, but the high exploit probability suggests a working exploit is likely near.

Do this: Deploy the Microsoft patch for CVE-2024-43640 to all Windows Server 2022 and Windows 10 21H2 systems this week, prioritizing domain controllers and internet-facing servers.

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

Senserva AI Opinion and rich prompt for CVE-2024-43640

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-2024-43640 (source: https://senserva.com/cve/CVE-2024-43640.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2024-43640: High severity Microsoft vulnerability, CVSS 7.8
- EPSS 30-day exploitation probability: 82%
- Actively exploited (CISA KEV): no
- Fixed by: KB5046613, KB5046616, KB5046633, KB5046698
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 82%).

Fixed by KB5046613 and 3 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-2024-43640

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5046613, KB5046616, KB5046633, KB5046698 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-2024-43640. 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.

KB5046613 KB5046616 KB5046633 KB5046698

Scope and sources

Affected products

Fixed by the same updates

CVE-2024-49039 CVE-2024-43451 CVE-2024-43639 CVE-2024-43620 CVE-2024-43621 CVE-2024-43622 CVE-2024-43624 CVE-2024-43627

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.