Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An attacker who successfully exploited the vulnerability could bypass the MapURLToZone method.
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
The user would have to click on a specially crafted drive path to be compromised by the attacker.
The Security Updates table indicates that this vulnerability affects all supported versions of Microsoft Windows. Why are IE Cumulative updates listed for Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2?
While Microsoft has announced retirement of the Internet Explorer 11 application on certain platforms and the Microsoft Edge Legacy application is deprecated, the underlying MSHTML, EdgeHTML, and scripting platforms are still supported. The MSHTML platform is used by Internet Explorer mode in Microsoft Edge as well as other applications through WebBrowser control. The EdgeHTML platform is used by WebView and some UWP applications. The scripting platforms are used by MSHTML and EdgeHTML but can also be used by other legacy applications. Updates to address vulnerabilities in the MSHTML platform and scripting engine are included in the IE Cumulative Updates; EdgeHTML and Chakra changes are not applicable to those platforms.
To stay fully protected, we recommend that customers who install Security Only updates install the IE Cumulative updates for this vulnerability.
According to the CVSS metrics, successful exploitation of this vulnerability could lead to some loss of confidentiality (C:L),but lead to no loss of availability (A:N) and integrity (I:N)? What does that mean for this vulnerability?
An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality) but not all resources within the impacted component may be divulged to the attacker. The attacker cannot make changes to disclosed information (Integrity) or limit access to the resource (Availability).
Security updates
10.0.17763.7792 — https://support.microsoft.com/help/5065428
10.0.20348.4171 — https://support.microsoft.com/help/5065432
10.0.20348.4106 — https://support.microsoft.com/help/5065306
10.0.19044.6332 — https://support.microsoft.com/help/5065429
10.0.22621.5909 — https://support.microsoft.com/help/5065431
10.0.26100.6584 — https://support.microsoft.com/help/5065426
10.0.26100.6508 — https://support.microsoft.com/help/5065474
10.0.25398.1849 — https://support.microsoft.com/help/5065425
10.0.10240.21128 — https://support.microsoft.com/help/5065430
10.0.14393.8422 — https://support.microsoft.com/help/5065427
6.0.6003.23529 — https://support.microsoft.com/help/5065508
6.0.6003.23529 — https://support.microsoft.com/help/5065511
1.000 — https://support.microsoft.com/help/5065435
6.1.7601.27929 — https://support.microsoft.com/help/5065468
6.1.7601.27929 — https://support.microsoft.com/help/5065510
6.2.9200.25675 — https://support.microsoft.com/help/5065509
6.3.9600.22774 — https://support.microsoft.com/help/5065507
Vulnerabilities 1
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Medium 4.3
MapUrlToZone Security Feature Bypass Vulnerability
Protection mechanism failure in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.
Revision history
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#1
Information published.
References
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CVE-2025-54917 MapUrlToZone Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54917
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss