Remote code execution via undisclosed memory corruption
Published Jul 16, 2021 · Updated Aug 10, 2026
Memory corruption in Microsoft Windows Scripting Engine allows remote attackers to execute code after interaction with crafted content. Microsoft has not published the affected function, object type, or precise invalid memory operation beyond classifying the issue as an out-of-bounds write. Exploitation requires a user to open attacker-controlled content and runs code in that user's security context; CISA records exploitation in the wild.
Summary
What happened
Memory corruption in Microsoft Windows Scripting Engine allows remote attackers to execute code after interaction with crafted content. Microsoft has not published the affected function, object type, or precise invalid memory operation beyond classifying the issue as an out-of-bounds write. Exploitation requires a user to open attacker-controlled content and runs code in that user's security context; CISA records exploitation in the wild.
The record
- CVE
- CVE-2021-34448
- Published
- Jul 16, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2021CVE publishedPublication date reported by the CVE source.
- Nov 3, 2021Exploitation reportedCISA Known Exploited Vulnerabilities listing for CVE-2021-34448
- Aug 10, 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.
- Affected versionversion=10.0.10240.0 <10.0.10240.19003
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.
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
- CISA Known Exploited Vulnerabilities listing for CVE-2021-34448known exploited catalog
Technologies
Your stack
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Your stack
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