CVE-2024-43573: Microsoft Windows MSHTML Platform Spoofing Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 8 Oct 2024, the same day the CVE record was published.

How likely is exploitation in the next 30 days?

46.1%

EPSS score, percentile 98.8 of all scored records

How severe?

6.5 Medium

CVSS v3.1 base score, given by the CNA

What should I do?

CISA deadline 29 Oct 2024. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Advisories and patches (1)

Which versions are affected?

Affected

• from 10.0.10240.0 to before 10.0.10240.20796
• from 10.0.14393.0 to before 10.0.14393.7428
• from 10.0.17763.0 to before 10.0.17763.6414
• from 10.0.19043.0 to before 10.0.19044.5011
• from 10.0.19045.0 to before 10.0.19045.5011
• from 10.0.22000.0 to before 10.0.22000.3260

and 12 more in the table below

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 29 October 2024.

Advisories and patches

• Windows MSHTML Platform Spoofing Vulnerability (Vendor advisory, Patch)

Linked from CISA's catalog entry

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43573
• https://nvd.nist.gov/vuln/detail/CVE-2024-43573

Affected products and versions

As listed in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Microsoft Windows MSHTML Platform contains an unspecified spoofing vulnerability which can lead to a loss of confidentiality.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2024-43573 to its Known Exploited Vulnerabilities (KEV) catalog on 8 Oct 2024.
• CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
• The due date CISA sets for the required action is 29 Oct 2024.
• The CVE record was published on 8 Oct 2024, the same day it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 6.5 (Medium), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 46.1% (percentile 98.8), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Windows MSHTML Platform Spoofing Vulnerability

Windows MSHTML Platform Spoofing Vulnerability

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

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