CVE-2025-15584 is a medium-severity integer overflow vulnerability identified in the Endpoint Data Loss Prevention (DLP) Module of the Netskope Client for Windows systems. The vulnerability arises from improper handling of integer values within the filter communication port of the DLP module, which can be triggered by an unprivileged local user. This integer overflow (CWE-190) can cause the system to crash with a Blue Screen of Death (BSOD), effectively resulting in a denial-of-service (DoS) condition on the affected machine. The flaw requires the Endpoint DLP module to be enabled in the client configuration, and exploitation does not require user interaction or elevated privileges beyond local user access. The CVSS 4.0 vector (AV:L/AC:L/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N) indicates that the attack vector is local, with low complexity, no authentication needed beyond local privileges, and no user interaction. The vulnerability impacts system availability but does not affect confidentiality or integrity. No known exploits have been reported in the wild, and no patches have been released at the time of publication. Organizations using Netskope Endpoint DLP on Windows should prioritize monitoring and prepare to deploy patches once available. The vulnerability highlights the importance of secure coding practices in endpoint security modules, especially those operating with kernel or filter drivers that interact closely with the OS.

The primary impact of CVE-2025-15584 is a denial-of-service condition on Windows endpoints running the Netskope Endpoint DLP module. Successful exploitation causes a system crash (BSOD), leading to loss of availability of the affected machine. This can disrupt user productivity and potentially impact business operations, especially in environments where endpoint DLP is critical for data protection and compliance. Since the exploit requires local access, the risk is higher in environments where multiple users share machines or where attackers can gain local user access through other means (e.g., phishing, lateral movement). The vulnerability does not compromise confidentiality or integrity, so data theft or modification is not directly possible via this flaw. However, repeated or targeted DoS attacks could degrade endpoint security posture or cause operational disruptions. Organizations relying heavily on Netskope Endpoint DLP for regulatory compliance or data protection may face increased risk of operational impact. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once patches are released.

To mitigate CVE-2025-15584, organizations should implement the following specific measures: 1) Restrict local user access on Windows endpoints to trusted personnel only, minimizing the risk of unprivileged users triggering the overflow. 2) Disable the Netskope Endpoint DLP module on clients where it is not strictly required, reducing the attack surface. 3) Monitor system logs and endpoint stability for signs of unexpected BSODs or crashes that could indicate exploitation attempts. 4) Establish a rapid patch management process to deploy updates from Netskope as soon as patches become available. 5) Employ endpoint protection solutions that can detect abnormal local user behavior or attempts to exploit kernel-level vulnerabilities. 6) Conduct regular security awareness training to reduce the risk of attackers gaining local access through social engineering or credential compromise. 7) Consider network segmentation and least privilege principles to limit lateral movement opportunities that could lead to local access on vulnerable endpoints. These targeted actions go beyond generic advice by focusing on reducing local user risk and preparing for timely patch deployment.