Security-feature bypass via remote-path misclassification
Published May 9, 2023 · Updated Jul 10, 2025
Security feature bypass in Microsoft Windows MSHTML allows remote attackers to evade URL zone checks through a crafted remote path. MapUrlToZone calls CreateUri, which converts the crafted device-style UNC path into a local-looking URL while CreateFile still routes the original path to a remote SMB server. No authentication or user interaction is required; in the Outlook attack path, the bypass permits an unsolicited message to trigger an SMB connection and expose an NTLM credential hash.
Summary
What happened
Security feature bypass in Microsoft Windows MSHTML allows remote attackers to evade URL zone checks through a crafted remote path. MapUrlToZone calls CreateUri, which converts the crafted device-style UNC path into a local-looking URL while CreateFile still routes the original path to a remote SMB server. No authentication or user interaction is required; in the Outlook attack path, the bypass permits an unsolicited message to trigger an SMB connection and expose an NTLM credential hash.
The record
- CVE
- CVE-2023-29324
- Published
- May 9, 2023
- Updated
- Jul 10, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-73, T1187
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 9, 2023CVE publishedPublication date reported by the CVE source.
- Jul 10, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.10240.0 <10.0.10240.19926
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
- Akamai MapUrlToZone bypass demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo