CyberSecBulletin
CVE-2026-71330NVD status: Analyzed

Windows 10 Version 1607: Exposure of Sensitive System Information to an Unauthorized Control Sphere

Published Updated By the CyberSecBulletin desk

CVE-2026-71330 is a high-severity exposure of sensitive system information to an unauthorized control sphere vulnerability in Windows 10 Version 1607 from Microsoft, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 10.0.14393.9512 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 1.03% chance of exploitation within 30 days, higher than 64% 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 10.0.14393.9512 or a later version.
  2. Update Windows 10 Version 1809 to 10.0.17763.9245 or a later version.
  3. Update Windows 10 Version 21H2 to 10.0.19044.7725 or a later version.
  4. Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
MicrosoftWindows 10 Version 160710.0.14393.0 up to, but not including, 10.0.14393.951210.0.14393.9512
MicrosoftWindows 10 Version 180910.0.17763.0 up to, but not including, 10.0.17763.924510.0.17763.9245
MicrosoftWindows 10 Version 21H210.0.19044.0 up to, but not including, 10.0.19044.772510.0.19044.7725
MicrosoftWindows 10 Version 22H210.0.19045.0 up to, but not including, 10.0.19045.772510.0.19045.7725
MicrosoftWindows 11 version 23H210.0.22631.0 up to, but not including, 10.0.22631.758210.0.22631.7582
MicrosoftWindows 11 Version 24H210.0.26100.0 up to, but not including, 10.0.26100.944510.0.26100.9445
MicrosoftWindows 11 Version 25H210.0.26200.0 up to, but not including, 10.0.26200.944510.0.26200.9445
MicrosoftWindows 11 version 26H110.0.28000.0 up to, but not including, 10.0.28000.295410.0.28000.2954
MicrosoftWindows Server 20126.2.9200.0 up to, but not including, 6.2.9200.263496.2.9200.26349
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 up to, but not including, 6.2.9200.263496.2.9200.26349
MicrosoftWindows Server 2012 R26.3.9600.0 up to, but not including, 6.3.9600.233986.3.9600.23398
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 up to, but not including, 6.3.9600.233986.3.9600.23398
MicrosoftWindows Server 201610.0.14393.0 up to, but not including, 10.0.14393.951210.0.14393.9512
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 up to, but not including, 10.0.14393.951210.0.14393.9512
MicrosoftWindows Server 201910.0.17763.0 up to, but not including, 10.0.17763.924510.0.17763.9245
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 up to, but not including, 10.0.17763.924510.0.17763.9245
MicrosoftWindows Server 202210.0.20348.0 up to, but not including, 10.0.20348.562210.0.20348.5622
MicrosoftWindows Server 202510.0.26100.0 up to, but not including, 10.0.26100.3343810.0.26100.33438
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 up to, but not including, 10.0.26100.3343810.0.26100.33438
MicrosoftWindows 10 1607before 10.0.14393.951210.0.14393.9512
MicrosoftWindows 10 1809before 10.0.17763.924510.0.17763.9245
MicrosoftWindows 10 21h2before 10.0.19044.772510.0.19044.7725
MicrosoftWindows 10 22h2before 10.0.19045.772510.0.19045.7725
MicrosoftWindows 11 23h2before 10.0.22631.758210.0.22631.7582
MicrosoftWindows 11 24h2before 10.0.26100.944510.0.26100.9445

Version data comes from the organisation that assigned the CVE; 2 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
NoneNo account or login is needed.
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
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

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

Official description

Exposure of sensitive system information to an unauthorized control sphere in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to disclose information over a network.

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

The underlying weakness: Exposure of Sensitive System Information to an Unauthorized Control Sphere

The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does.

How developers prevent this class of flaw

  • Production applications should never use methods that generate internal details such as stack traces and error messages unless that information is directly committed to a log that is not viewable by the end user. All error message text should be HTML entity encoded before being written to the log file to protect against potential cross-site scripting attacks against the viewer of the logs

More Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerabilities (CWE-497)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerabilities

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