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Vulnerabilities

Vulnerability · CVE-2025-54917

Protection mechanism failure in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

Published Sep 9, 2025 · catalog updated Feb 20, 2026 · Microsoft Windows 10 Version 21H2

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-54917. EPSS is 0.95%. Act only if a listed version of Microsoft Windows 10 Version 21H2 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium4.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.95%
Remediation
Version ranges on file
Affected products
vendor Microsoft Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.6332

Protection mechanism failure in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.633210.0.19044.0 <10.0.19044.6332

How to fix CVE-2025-54917

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-54917. EPSS is 0.95%. Act only if a listed version of Microsoft Windows 10 Version 21H2 is installed.

Which versions are affected?

Compare what you have installed with Microsoft Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.6332 10.0.19044.0 <10.0.19044.6332. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.95%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 9, 2025 · EUVD

    Detected

    Protection mechanism failure in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

  2. Feb 20, 2026 · EUVD

    Updated

    Protection mechanism failure in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

Sources

  • CVE.orgVulnerability recordCVE-2025-54917

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-54917

    30-day exploitation probability 0.95%

    first.org
  • EUVDVulnerability recordEUVD-2025-27297

    Protection mechanism failure in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026