Security bypass via inconsistent device-path classification
Published Aug 8, 2023 · Updated Aug 10, 2026
A security-feature bypass in Windows HTML Platforms allows remote attackers to evade remote-path protections with a crafted path. MapUrlToZone and CreateFile classify the same local-device path differently, allowing a path treated as local to resolve to an attacker-controlled remote resource. Exploitation requires the crafted path to be processed; Outlook delivery can trigger an outbound SMB authentication attempt without a click.
Summary
What happened
A security-feature bypass in Windows HTML Platforms allows remote attackers to evade remote-path protections with a crafted path. MapUrlToZone and CreateFile classify the same local-device path differently, allowing a path treated as local to resolve to an attacker-controlled remote resource. Exploitation requires the crafted path to be processed; Outlook delivery can trigger an outbound SMB authentication attempt without a click.
The record
- CVE
- CVE-2023-35384
- Published
- Aug 8, 2023
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-73, T1187
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 8, 2023CVE publishedPublication date reported by the CVE source.
- 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 <10.0.10240.20107
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
- MapUrlToZone path-classification bypass demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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