CVE-2025-59596 is a denial-of-service (DoS) vulnerability identified in Absolute Security's Secure Access Windows client software, specifically versions 12.0 through 14.10. The vulnerability arises when a local networking policy is active on the client system. An attacker positioned on an adjacent network segment can craft and send a malicious network packet that triggers a crash of the Secure Access client application, resulting in a denial of service. The vulnerability is classified under CWE-20, indicating improper input validation or handling. Exploitation does not require authentication or user interaction, but the attacker must be on an adjacent network, which limits the attack surface to local or bridged network environments. The vulnerability impacts the availability of the client system by causing it to crash, potentially disrupting secure remote access sessions. The vendor has addressed this issue in Secure Access version 14.12, and users are advised to upgrade. No public exploits have been reported to date, but the medium CVSS score of 6.0 reflects the moderate risk posed by this vulnerability due to its ease of exploitation within the specified network context and its impact on availability.

For European organizations, this vulnerability could disrupt secure remote access services, particularly in enterprises and government agencies relying on Absolute Security Secure Access clients for network connectivity and policy enforcement. The denial-of-service condition could lead to temporary loss of access to critical systems, impacting business continuity and operational efficiency. Organizations with strict local networking policies are more susceptible, as the vulnerability requires such policies to be active. This could affect sectors with high security requirements such as finance, healthcare, and critical infrastructure. While the vulnerability does not compromise confidentiality or integrity, the availability impact could hinder incident response, remote work capabilities, and secure communications. The lack of known exploits reduces immediate risk, but the potential for targeted attacks in sensitive environments remains. European entities with adjacent network topologies, such as segmented internal networks or VPN concentrators, may face higher exposure.

Organizations should prioritize upgrading all affected Secure Access Windows clients to version 14.12 or later to remediate the vulnerability. Network administrators should review and tighten local networking policies to minimize unnecessary adjacency between untrusted network segments and Secure Access clients. Implementing network segmentation and strict access controls can reduce the attack surface. Monitoring network traffic for unusual or malformed packets targeting Secure Access clients can help detect attempted exploitation. Additionally, deploying endpoint detection and response (EDR) solutions capable of identifying client crashes or abnormal behavior may aid in early detection. Regular vulnerability scanning and asset inventory to identify all instances of affected software versions are essential. Finally, organizations should ensure incident response plans account for potential denial-of-service scenarios affecting remote access tools.