CVE-2025-30397Known exploitationNetwork attack vector

Code execution via Scripting Engine type confusion

Published May 13, 2025 · Updated Feb 26, 2026

Type confusion in Microsoft Scripting Engine on affected Windows releases allows remote attackers to execute code via a crafted URL. The engine accesses a resource using a type incompatible with the type used to initialize or allocate it, corrupting memory during script processing. Exploitation requires a user to open the crafted URL; successful code runs in the user's security context.

CVSS severity7.5
High
EPSS probability26.83%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Microsoft Scripting Engine on affected Windows releases allows remote attackers to execute code via a crafted URL. The engine accesses a resource using a type incompatible with the type used to initialize or allocate it, corrupting memory during script processing. Exploitation requires a user to open the crafted URL; successful code runs in the user's security context.

The record

CVE
CVE-2025-30397
Published
May 13, 2025
Updated
Feb 26, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-843, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2025Exploitation reportedCISA Known Exploited Vulnerabilities entry
  2. May 13, 2025CVE publishedPublication date reported by the CVE source.
  3. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.10240.0 <10.0.10240.21014

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.21014
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.7314
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.4061
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.8066
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.4061
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.25475
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.25475
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.5854
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1611
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.8066
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.5335
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.27729
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.27729
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.5854
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.22577
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.7314
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.5335
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.5335
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.8066
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.23279
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.3692
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.4061
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.7314
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.22577
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.23279

Published CVSS scores

7.5MicrosoftCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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