CVE-2025-21269Public exploitNetwork attack vector

Security feature bypass via double-slash UNC path

Published Jan 14, 2025 · Updated Jun 9, 2026

Security feature bypass in Microsoft Windows allows remote attackers to misclassify a remote file as local via a crafted UNC path. In CrackUrlFile, MapUrlToZone skips only one separator after LanmanRedirector; a second slash yields an empty hostname and URLZONE_LOCAL_MACHINE for an SMB resource. User interaction is required, and the documented impact is limited to information exposure through bypassed trust-zone protections.

CVSS severity4.3
Medium
EPSS probability4.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security feature bypass in Microsoft Windows allows remote attackers to misclassify a remote file as local via a crafted UNC path. In CrackUrlFile, MapUrlToZone skips only one separator after LanmanRedirector; a second slash yields an empty hostname and URLZONE_LOCAL_MACHINE for an SMB resource. User interaction is required, and the documented impact is limited to information exposure through bypassed trust-zone protections.

The record

CVE
CVE-2025-21269
Published
Jan 14, 2025
Updated
Jun 9, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-41, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record 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.

  1. Affected versionversion=10.0.10240.0 <10.0.10240.20890

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.20890
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.6775
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.2894
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.7699
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.2894
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.25273
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.25273
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.5371
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1369
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.7699
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.4751
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.27520
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.27520
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.5371
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.22371
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.6775
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.4751
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.4751
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.7699
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.23070
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.3091
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.2894
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.6775
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.22371
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.23070

Published CVSS scores

4.3Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-41Improper Resolution of Path Equivalence
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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