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CVE-2025-30397Exploited in the wildNVD status: Analyzed

Microsoft Windows Scripting Engine Type Confusion

Published Updated By the CyberSecBulletin desk

CVE-2025-30397 is a high-severity access of resource using incompatible type vulnerability in Windows 10 Version 1507 from Microsoft, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version 10.0.10240.21014 as the first without the flaw, so updating Windows 10 Version 1507 to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on May 13, 2025, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Update Windows 10 Version 1507 to 10.0.10240.21014 or a later version.
  2. Update Windows 10 Version 1607 to 10.0.14393.8066 or a later version.
  3. Update Windows 10 Version 1809 to 10.0.17763.7314 or a later version.
  4. CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  5. Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
  6. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  7. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
MicrosoftWindows 10 Version 150710.0.10240.0 up to, but not including, 10.0.10240.2101410.0.10240.21014
MicrosoftWindows 10 Version 160710.0.14393.0 up to, but not including, 10.0.14393.806610.0.14393.8066
MicrosoftWindows 10 Version 180910.0.17763.0 up to, but not including, 10.0.17763.731410.0.17763.7314
MicrosoftWindows 10 Version 21H210.0.19044.0 up to, but not including, 10.0.19044.585410.0.19044.5854
MicrosoftWindows 10 Version 22H210.0.19045.0 up to, but not including, 10.0.19045.585410.0.19045.5854
MicrosoftWindows 11 version 22H210.0.22621.0 up to, but not including, 10.0.22621.533510.0.22621.5335
MicrosoftWindows 11 version 22H310.0.22631.0 up to, but not including, 10.0.22631.533510.0.22631.5335
MicrosoftWindows 11 Version 23H210.0.22631.0 up to, but not including, 10.0.22631.533510.0.22631.5335
MicrosoftWindows 11 Version 24H210.0.26100.0 up to, but not including, 10.0.26100.406110.0.26100.4061
MicrosoftWindows Server 2008 R2 Service Pack 16.1.7601.0 up to, but not including, 6.1.7601.277296.1.7601.27729
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)6.1.7601.0 up to, but not including, 6.1.7601.277296.1.7601.27729
MicrosoftWindows Server 2008 Service Pack 26.0.6003.0 up to, but not including, 6.0.6003.232796.0.6003.23279
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)6.0.6003.0 up to, but not including, 6.0.6003.232796.0.6003.23279
MicrosoftWindows Server 20126.2.9200.0 up to, but not including, 6.2.9200.254756.2.9200.25475
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 up to, but not including, 6.2.9200.254756.2.9200.25475
MicrosoftWindows Server 2012 R26.3.9600.0 up to, but not including, 6.3.9600.225776.3.9600.22577
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 up to, but not including, 6.3.9600.225776.3.9600.22577
MicrosoftWindows Server 201610.0.14393.0 up to, but not including, 10.0.14393.806610.0.14393.8066
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 up to, but not including, 10.0.14393.806610.0.14393.8066
MicrosoftWindows Server 201910.0.17763.0 up to, but not including, 10.0.17763.731410.0.17763.7314
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 up to, but not including, 10.0.17763.731410.0.17763.7314
MicrosoftWindows Server 202210.0.20348.0 up to, but not including, 10.0.20348.369210.0.20348.3692
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 up to, but not including, 10.0.25398.161110.0.25398.1611
MicrosoftWindows Server 202510.0.26100.0 up to, but not including, 10.0.26100.406110.0.26100.4061
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 up to, but not including, 10.0.26100.406110.0.26100.4061

Version data comes from the organisation that assigned the CVE; 10 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by CNA (microsoft.com).

Official description

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

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Access of Resource Using Incompatible Type

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

More Access of Resource Using Incompatible Type vulnerabilities (CWE-843)

Timeline

  1. CVE record published.
  2. Added to CISA's Known Exploited Vulnerabilities catalogue.
  3. CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
  4. Deadline for US federal agencies to remediate, set by CISA.
  5. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Technical write-ups (may include proof of concept)

Other vulnerabilities in Windows 10 Version 1507

All Windows 10 Version 1507 vulnerabilities

Recent Access of Resource Using Incompatible Type vulnerabilities

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