CVE-2025-15641

Anti-tampering bypass via exposed driver IOCTL

Published Jun 17, 2026 · Updated Jun 17, 2026

Insufficient IOCTL access control in Netskope Client before R138 allows local administrators to bypass NSClient anti-tampering protections. The Windows driver accepts crafted requests to a customer IOCTL without sufficient access control, allowing its anti-tampering state to be altered. Administrative privileges on a Windows endpoint are required; the demonstrated consequence is disabling NSClient protections, not broader code execution.

CVSS severity6.8
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient IOCTL access control in Netskope Client before R138 allows local administrators to bypass NSClient anti-tampering protections. The Windows driver accepts crafted requests to a customer IOCTL without sufficient access control, allowing its anti-tampering state to be altered. Administrative privileges on a Windows endpoint are required; the demonstrated consequence is disabling NSClient protections, not broader code execution.

The record

CVE
CVE-2025-15641
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Netskope
Product
Netskope Client
Classifications
CWE-782, CAPEC-176, T1562.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <138

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Netskope · Netskope Clientversion=0 <138

Published CVSS scores

6.8NetskopeCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA: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.

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No observations available

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

Weakness, pattern, technique

CWE-782Exposed IOCTL with Insufficient Access Control
CAPEC-176Configuration/Environment Manipulation
T1562.001Impair Defenses: Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

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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