Windows MapUrlToZone Denial of Service Vulnerability
Released: Jan 14, 2025
- Assigning CNA
- Microsoft
- CVE.org link
- CVE-2025-21276
- Impact
- Denial of Service
- Max Severity
- Important
- Weakness
- CVSS Source
- Microsoft
- Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- Metrics
- CVSS:3.1 7.5 / 6.5Base score metrics: 7.5 / Temporal score metrics: 6.5
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Exploit Code Maturity
Unproven
Remediation Level
Official Fix
Report Confidence
Confirmed
Please see Common Vulnerability Scoring System for more information on the definition of these metrics.
Exploitability
The following table provides an exploitability assessment for this vulnerability at the time of original publication.
- Publicly disclosed
- No
- Exploited
- No
- Exploitability assessment
- Exploitation Less Likely
FAQ
According to the CVSS metric, successful exploitation of this vulnerability has a high impact on availability (A:H). What does that mean for this vulnerability?
An attacker can send specially crafted packets which could affect availability of the service and result in Denial of Service (DoS).
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.
Acknowledgements
- George Hughey with MSRC Vulnerabilities & Mitigations
Security Updates
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.
- 10.0.19045.5371
- 10.0.19045.5371
- 10.0.19045.5371
- 10.0.22621.4751
- 10.0.22621.4751
- 6.0.6003.23070
- 1.007
- 6.0.6003.23070
- 1.007
- 6.0.6003.23070
- 1.007
- 6.0.6003.23070
- 1.007
- 10.0.14393.7699
- 10.0.14393.7699
- 10.0.14393.7699
- 10.0.10240.20890
- 10.0.10240.20890
- 10.0.26100.2894
- 10.0.26100.2894
- 10.0.25398.1369
- 10.0.22631.4751
- 10.0.22631.4751
- 6.3.9600.22371
- 1.002
- 6.3.9600.22371
- 1.002
- 6.2.9200.25273
- 1.003
- 6.2.9200.25273
- 1.003
- 6.1.7601.27520
- 1.003
- 6.1.7601.27520
- 1.003
- 10.0.19044.5371
- 10.0.19044.5371
- 10.0.19044.5371
- 10.0.20348.3091
Disclaimer
Revisions
Information published.