CVE-2025-59596 in Secure Access
Summary
by MITRE • 11/05/2025
CVE-2025-59596 is a denial-of-service vulnerability in Secure Access Windows client versions 12.0 to 14.10 that is addressed in version 14.12. If a local networking policy is active, attackers on an adjacent network may be able to send a crafted packet and cause the client system to crash.
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Analysis
by VulDB Data Team • 02/10/2026
This vulnerability represents a critical denial-of-service weakness in the Secure Access Windows client software ecosystem affecting versions 12.0 through 14.10. The flaw manifests when specific local networking policies are active on the target system, creating an exploitable condition that allows remote attackers within the same network segment to trigger system instability. The vulnerability operates through the manipulation of network packets, specifically crafted to exploit an insufficient input validation mechanism within the client's network processing stack. This weakness directly maps to CWE-400, which encompasses unrestricted resource consumption vulnerabilities, and falls under the broader category of network protocol vulnerabilities that can lead to system unavailability.
The technical exploitation mechanism involves attackers sending specially formatted packets that cause the Secure Access client to enter an unrecoverable state during packet processing. When the client receives these malformed network packets, it fails to properly validate or sanitize the incoming data before processing, leading to a crash condition that results in complete system termination. The vulnerability's impact is amplified by the fact that it requires no authentication or elevated privileges to exploit, making it particularly dangerous in environments where adjacent network access is possible. This aligns with ATT&CK technique T1499.001 which covers network denial-of-service attacks that leverage protocol manipulation and system resource exhaustion.
The operational impact of CVE-2025-59596 extends beyond simple system crashes to encompass potential business disruption and service availability issues for organizations relying on Secure Access client functionality. In enterprise environments where these clients are deployed across multiple workstations, a successful exploitation could lead to cascading failures affecting productivity and operational continuity. The vulnerability's proximity to adjacent network access requirements suggests it may be particularly relevant in shared office spaces, data centers, or any environment where network segmentation is insufficient. Organizations with strict network security policies may be less vulnerable, but those with permissive local networking configurations face significant risk exposure.
Mitigation strategies should prioritize immediate deployment of the patched version 14.12, which addresses the underlying input validation flaw in the network packet processing components. Network administrators should implement additional defensive measures including firewall rules that limit adjacent network access to Secure Access client systems, packet filtering rules that inspect and validate incoming network traffic, and network segmentation strategies that isolate critical systems from potential attack vectors. The vulnerability highlights the importance of regular patch management and network monitoring for detecting anomalous packet patterns that may indicate exploitation attempts. Organizations should also consider implementing intrusion detection systems specifically configured to identify and alert on malformed network traffic patterns consistent with this vulnerability's exploitation methodology.