CVE-2025-15584: Netskope Endpoint DLP DoS Vulnerability

CVE-2025-15584 Overview

CVE-2025-15584 is an integer overflow vulnerability affecting the Endpoint DLP Module for Netskope Client on Windows systems. An unprivileged local user can exploit this vulnerability to trigger an integer overflow within the filter communication port, resulting in a Blue-Screen-of-Death (BSOD) and denial-of-service condition on the affected system.

Critical Impact

Successful exploitation allows unprivileged users to crash Windows systems running Netskope Client with Endpoint DLP enabled, causing denial of service through a kernel-level BSOD.

Affected Products

• Netskope Client for Windows (with Endpoint DLP Module enabled)

Discovery Timeline

• 2026-03-17 - CVE CVE-2025-15584 published to NVD
• 2026-03-18 - Last updated in NVD database

Technical Details for CVE-2025-15584

Vulnerability Analysis

This vulnerability stems from an integer overflow condition (CWE-190) within the Netskope Endpoint DLP driver's filter communication port handling. When processing input data, the driver fails to properly validate integer boundaries, allowing a specially crafted request to cause an arithmetic overflow. Since this vulnerability exists in kernel-mode driver code, triggering the overflow results in a system crash (BSOD) rather than a controlled error condition.

The vulnerability requires local access to exploit, meaning an attacker must already have low-privileged access to the target system. However, no user interaction is required once the attacker has local access, and the attack complexity is low. The exploitation specifically targets the communication channel between user-mode applications and the kernel-mode DLP filter driver.

Root Cause

The root cause is an improper integer overflow check (CWE-190: Integer Overflow or Wraparound) in the filter communication port component of the Endpoint DLP driver. When the driver processes size or length parameters, it fails to validate that integer arithmetic operations do not exceed the maximum bounds for the integer type, leading to unexpected behavior when wrapped values are used in subsequent memory operations.

Attack Vector

The attack vector is local, requiring an unprivileged user with access to the Windows system running Netskope Client. The attacker interacts with the filter communication port used by the Endpoint DLP driver, sending malformed data designed to trigger the integer overflow condition. Since the Endpoint DLP module must be enabled in the client configuration for successful exploitation, systems without this feature enabled are not vulnerable.

The vulnerability manifests in the driver's filter communication port handling. An attacker can craft requests that cause integer overflow when the driver calculates buffer sizes or offsets, leading to memory corruption and subsequent system crash. For detailed technical information, refer to the Netskope Security Advisory NSKPSA-2025-006.

Detection Methods for CVE-2025-15584

Indicators of Compromise

• Unexpected BSOD crashes on systems running Netskope Client with Endpoint DLP enabled
• Windows Event Log entries indicating driver crashes related to Netskope DLP components
• Multiple system crashes originating from the Netskope filter driver (DRIVER_IRQL_NOT_LESS_OR_EQUAL or similar stop codes)
• Suspicious local process activity attempting to communicate with Netskope filter communication ports

Detection Strategies

• Monitor Windows Event Logs for crash events related to Netskope driver components
• Deploy endpoint detection rules to identify unusual interactions with the Netskope DLP filter communication port
• Configure Windows Error Reporting to capture and analyze crash dumps for evidence of exploitation attempts
• Use SentinelOne's behavioral AI to detect anomalous process behavior targeting kernel drivers

Monitoring Recommendations

• Enable verbose logging for Netskope Client operations where available
• Monitor for patterns of repeated system crashes that may indicate exploitation attempts
• Implement centralized crash dump collection for analysis across the enterprise
• Track user activity on systems that experience unexpected BSOD events

How to Mitigate CVE-2025-15584

Immediate Actions Required

• Review the Netskope Security Advisory NSKPSA-2025-006 for patch availability and installation instructions
• Inventory all systems running Netskope Client with Endpoint DLP enabled
• Apply the vendor-provided security update as soon as it becomes available
• Consider temporarily disabling the Endpoint DLP module on critical systems if an immediate patch is not available

Patch Information

Netskope has released information regarding this vulnerability in security advisory NSKPSA-2025-006. Organizations should consult the Netskope Security Advisory for specific patch versions and deployment guidance. Ensure all Netskope Client installations are updated to the patched version to remediate this vulnerability.

Workarounds

• Disable the Endpoint DLP module in Netskope Client configuration if the functionality is not required
• Restrict local access to sensitive systems to reduce the attack surface for local exploitation
• Implement application whitelisting to prevent unauthorized applications from interacting with driver communication ports
• Monitor and audit local user activities on systems where the Endpoint DLP module must remain enabled

# Configuration example
# Review Netskope Client configuration to check Endpoint DLP status
# Consult Netskope documentation for disabling Endpoint DLP module as a temporary workaround
# Contact Netskope support for guidance on secure configuration pending patch deployment