Remote code execution via JScript9 type confusion
Published Aug 13, 2024 · Updated Oct 21, 2025
Type confusion in Microsoft Windows JScript9 allows remote attackers to execute code through a crafted URL opened by a user. The engine handles a value as an incompatible object type while processing attacker-controlled script, corrupting memory in the current process. Exploitation requires user interaction and runs code with the user's privileges; CISA records active exploitation.
Summary
What happened
Type confusion in Microsoft Windows JScript9 allows remote attackers to execute code through a crafted URL opened by a user. The engine handles a value as an incompatible object type while processing attacker-controlled script, corrupting memory in the current process. Exploitation requires user interaction and runs code with the user's privileges; CISA records active exploitation.
The record
- CVE
- CVE-2024-38178
- Published
- Aug 13, 2024
- Updated
- Oct 21, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-843, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 13, 2024Exploitation reportedCISA Known Exploited Vulnerabilities listing
- Aug 13, 2024CVE publishedPublication date reported by the CVE source.
- Oct 21, 2025Record 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.
- Affected versionversion=10.0.10240.0 <10.0.10240.20751
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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