CVE-2025-30397: Microsoft Windows Scripting Engine Type Confusion Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 13 May 2025, the same day the CVE record was published.

How likely is exploitation in the next 30 days?

27.3%

EPSS score, percentile 98.1 of all scored records

How severe?

7.5 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA deadline 3 Jun 2025. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, 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 10.0.10240.21014
• from 10.0.14393.0 to before 10.0.14393.8066
• from 10.0.17763.0 to before 10.0.17763.7314
• from 10.0.19044.0 to before 10.0.19044.5854
• from 10.0.19045.0 to before 10.0.19045.5854
• from 10.0.22621.0 to before 10.0.22621.5335

and 14 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: 3 June 2025.

Advisories and patches

• Scripting Engine Memory Corruption Vulnerability (Vendor advisory, Patch)

Linked from CISA's catalog entry

• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-30397
• https://nvd.nist.gov/vuln/detail/CVE-2025-30397

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 Scripting Engine contains a type confusion vulnerability that allows an unauthorized attacker to execute code over a network via a specially crafted URL.

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

• CISA added CVE-2025-30397 to its Known Exploited Vulnerabilities (KEV) catalog on 13 May 2025.
• 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 3 Jun 2025.
• The CVE record was published on 13 May 2025, the same day it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 7.5 (High), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 27.3% (percentile 98.1), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

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

Scripting Engine Memory Corruption Vulnerability

Access of resource using incompatible type ('type confusion') in Microsoft Scripting Engine allows an unauthorized attacker to execute code over a network.

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

Weakness

• CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

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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