CVE-2025-21276
Published: 14 January 2025
Summary
CVE-2025-21276 is a high-severity Wrap or Wraparound (CWE-191) vulnerability in Microsoft Windows 10 1507. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked in the top 8.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Flaw remediation directly prevents exploitation of CVE-2025-21276 by applying Microsoft patches to the vulnerable MapUrlToZone component.
Denial-of-service protection mechanisms such as rate limiting and resource controls mitigate remote unauthenticated attacks causing availability impact via MapUrlToZone.
Information input validation restricts malformed URL inputs that trigger the DoS condition in the MapUrlToZone component.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated exploitation of the MapUrlToZone component directly enables endpoint DoS via application/system exploitation (T1499.004).
NVD Description
Windows MapUrlToZone Denial of Service Vulnerability
Deeper analysisAI
CVE-2025-21276 is a Denial of Service vulnerability affecting the MapUrlToZone component in Microsoft Windows operating systems. Published on January 14, 2025, it has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is associated with CWEs 191, 693, and NVD-CWE-noinfo.
The vulnerability can be exploited by an unauthenticated attacker over the network with low attack complexity and no user interaction required. Successful exploitation results in a denial of service condition, causing high impact to availability while having no impact on confidentiality or integrity.
Microsoft's Security Response Center provides detailed update guidance, including patches and mitigation recommendations, at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21276.
Details
- CWE(s)