Code execution via unchecked 3D file parsing
Published Jun 8, 2021 · Updated May 28, 2026
Remote code execution in Microsoft Paint 3D before 6.2105.4017.0 allows remote attackers to execute code via malicious GLB or STL files. The GLB and STL parsers fail to validate attacker-supplied structure lengths, causing out-of-bounds reads that enable code execution in the low-integrity process. Exploitation requires the target to visit a malicious page or open a crafted file; the resulting code runs with the current Paint 3D process integrity.
Summary
What happened
Remote code execution in Microsoft Paint 3D before 6.2105.4017.0 allows remote attackers to execute code via malicious GLB or STL files. The GLB and STL parsers fail to validate attacker-supplied structure lengths, causing out-of-bounds reads that enable code execution in the low-integrity process. Exploitation requires the target to visit a malicious page or open a crafted file; the resulting code runs with the current Paint 3D process integrity.
The record
- CVE
- CVE-2021-31946
- Published
- Jun 8, 2021
- Updated
- May 28, 2026
- Vendor
- Microsoft
- Product
- Paint 3D
- Classifications
- CWE-000, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 8, 2021CVE publishedPublication date reported by the CVE source.
- May 28, 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=6.0.0 <6.2105.4017.0
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.
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Technologies
Your stack
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Your stack
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