CyberSecBulletin
CVE-2026-25177NVD status: Analyzed

Windows 10 Version 1607: Improper Restriction of Names for Files and Other Resources

Published Updated By the CyberSecBulletin desk

CVE-2026-25177 is a high-severity improper restriction of names for files and other resources vulnerability in Windows 10 Version 1607 from Microsoft, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 10.0.14393.8957 as the first without the flaw, so updating Windows 10 Version 1607 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.35% chance of exploitation within 30 days, higher than 72% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Windows 10 Version 1607 to 10.0.14393.8957 or a later version.
  2. Update Windows 10 Version 1809 to 10.0.17763.8511 or a later version.
  3. Update Windows 10 Version 21H2 to 10.0.19044.7058 or a later version.
  4. Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
MicrosoftWindows 10 Version 160710.0.14393.0 up to, but not including, 10.0.14393.895710.0.14393.8957
MicrosoftWindows 10 Version 180910.0.17763.0 up to, but not including, 10.0.17763.851110.0.17763.8511
MicrosoftWindows 10 Version 21H210.0.19044.0 up to, but not including, 10.0.19044.705810.0.19044.7058
MicrosoftWindows 10 Version 22H210.0.19045.0 up to, but not including, 10.0.19045.705810.0.19045.7058
MicrosoftWindows 11 version 22H310.0.22631.0 up to, but not including, 10.0.22631.678310.0.22631.6783
MicrosoftWindows 11 Version 23H210.0.22631.0 up to, but not including, 10.0.22631.678310.0.22631.6783
MicrosoftWindows 11 Version 24H210.0.26100.0 up to, but not including, 10.0.26100.803710.0.26100.8037
MicrosoftWindows 11 Version 25H210.0.26200.0 up to, but not including, 10.0.26200.803710.0.26200.8037
MicrosoftWindows 11 version 26H110.0.28000.0 up to, but not including, 10.0.28000.171910.0.28000.1719
MicrosoftWindows Server 20126.2.9200.0 up to, but not including, 6.2.9200.259736.2.9200.25973
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 up to, but not including, 6.2.9200.259736.2.9200.25973
MicrosoftWindows Server 2012 R26.3.9600.0 up to, but not including, 6.3.9600.230746.3.9600.23074
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 up to, but not including, 6.3.9600.230746.3.9600.23074
MicrosoftWindows Server 201610.0.14393.0 up to, but not including, 10.0.14393.895710.0.14393.8957
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 up to, but not including, 10.0.14393.895710.0.14393.8957
MicrosoftWindows Server 201910.0.17763.0 up to, but not including, 10.0.17763.851110.0.17763.8511
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 up to, but not including, 10.0.17763.851110.0.17763.8511
MicrosoftWindows Server 202210.0.20348.0 up to, but not including, 10.0.20348.489310.0.20348.4893
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 up to, but not including, 10.0.25398.220710.0.25398.2207
MicrosoftWindows Server 202510.0.26100.0 up to, but not including, 10.0.26100.3252210.0.26100.32522
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 up to, but not including, 10.0.26100.3252210.0.26100.32522
MicrosoftWindows 10 1607before 10.0.14393.895710.0.14393.8957
MicrosoftWindows 10 1809before 10.0.17763.851110.0.17763.8511
MicrosoftWindows 10 21h2before 10.0.19044.705810.0.19044.7058
MicrosoftWindows 10 22h2before 10.0.19045.705810.0.19045.7058

Version data comes from the organisation that assigned the CVE; 5 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (microsoft.com).

Official description

Improper restriction of names for files and other resources in Active Directory Domain Services allows an authorized attacker to elevate privileges over a network.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Restriction of Names for Files and Other Resources

The product constructs the name of a file or other resource using input from an upstream component, but it does not restrict or incorrectly restricts the resulting name.

How developers prevent this class of flaw

  • Do not allow users to control names of resources used on the server side.
  • Perform allowlist input validation at entry points and also before consuming the resources. Reject bad file names rather than trying to cleanse them.
  • Make sure that technologies consuming the resources are not vulnerable (e.g. buffer overflow, format string, etc.) in a way that would allow code execution if the name of the resource is malformed.

More Improper Restriction of Names for Files and Other Resources vulnerabilities (CWE-641)

Timeline

  1. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  2. CVE record published.
  3. Record last changed materially (score, affected products, status or references).

References

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