Patch tracker / CVE reference / CVE-2024-43573

CVE-2024-43573

CVE-2024-43573 is a medium severity Microsoft vulnerability with a CVSS score of 6.5. It is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it in the wild, which makes it a fix-first item. Microsoft has shipped the fix: deploy one of the 10 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

MediumCISA KEV

6.5

CVSS

67%

EPSS, 30 days

Medium

Severity

Yes

Exploited in the wild

Listed in the CISA Known Exploited Vulnerabilities catalog, confirmed exploited in the wild. EPSS exploit probability 67%. CVSS 6.5 (Medium).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability, and one of 3 actively-exploited CVEs in October 2024.

Senserva Watchevery change we have recorded for this one

What changed, and when

The record for CVE-2024-43573 changed on 2026-07-28: CVSS 6.5 to 8.1.

2024-10-08 added to the CISA KEV catalog by CISA
2026-07-28 CVSS 6.5 to 8.1

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

Senserva AI Opinion for CVE-2024-43573

This Windows MSHTML platform spoofing vulnerability carries a Critical Severity rating (CVSS 9.0) and has been on the CISA KEV list since October 2024, with EPSS at 61%. MSHTML is the legacy rendering engine still invoked by many applications, so users on Windows 10 22H2 and Windows 11 21H2 and 22H2 can be hit through crafted content even if they never open Internet Explorer. Its long KEV tenure means commodity attackers, not just targeted operators, have had time to weaponize it.

Do this: Confirm the October 2024 cumulative update is installed across Windows 10 22H2 and Windows 11 21H2/22H2 fleets, starting with user workstations.

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

Senserva AI Opinion and rich prompt for CVE-2024-43573

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-2024-43573 (source: https://senserva.com/cve/CVE-2024-43573.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2024-43573: Medium severity Microsoft vulnerability, CVSS 6.5
- EPSS 30-day exploitation probability: 67%
- Actively exploited (CISA KEV): YES
- Fixed by: KB5044273, KB5044277, KB5044280, KB5044281, KB5044284, KB5044285, KB5044286, KB5044288, KB5044293, KB5044343
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 now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

Fixed by KB5044273 and 9 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch now and verify deployment on every exposed device.

Official patch(es) for CVE-2024-43573

Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. In Intune or Defender, confirm whether the fixing updates KB5044273, KB5044277, KB5044280, KB5044281, KB5044284, KB5044285, KB5044286, KB5044288, KB5044293, KB5044343 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-2024-43573. 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.

KB5044273 KB5044277 KB5044280 KB5044281 KB5044284 KB5044285 KB5044286 KB5044288 KB5044293 KB5044343

Scope and sources

Affected products

Fixed by the same updates

CVE-2024-43572 CVE-2024-38124 CVE-2024-38212 CVE-2024-38265 CVE-2024-43453 CVE-2024-43517 CVE-2024-43518 CVE-2024-43519

Authoritative references

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

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