CVE-2025-50159 in Windows
Summary
by MITRE • 08/12/2025
Use after free in Remote Access Point-to-Point Protocol (PPP) EAP-TLS allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability CVE-2025-50159 represents a critical use-after-free flaw within the Remote Access Point-to-Point Protocol implementation specifically affecting EAP-TLS authentication mechanisms. This issue occurs when the system processes EAP-TLS packets and fails to properly manage memory references after freeing allocated resources, creating a scenario where subsequent operations attempt to access memory that has already been released. The vulnerability is particularly concerning because it requires only authorized network access to exploit, meaning an attacker who has already established a valid PPP connection can leverage this flaw to escalate privileges locally on the affected system. The use-after-free condition typically arises from improper handling of memory allocation and deallocation sequences within the PPP protocol stack, where the EAP-TLS module does not adequately track reference counts or validate memory state before subsequent operations. This type of vulnerability falls under CWE-416, which specifically addresses the use of freed memory conditions in software implementations.
The operational impact of this vulnerability extends beyond simple privilege escalation as it can potentially allow an attacker to gain unauthorized access to system resources, execute arbitrary code with elevated privileges, or compromise the integrity of the authentication system. When an authorized user establishes a PPP connection using EAP-TLS, the attacker can manipulate the authentication process to trigger the use-after-free condition, potentially leading to a local privilege escalation that could enable full system compromise. The exploitation typically requires the attacker to be authenticated to the network and able to send crafted EAP-TLS packets that will cause the memory management functions to release memory while maintaining references to it. This creates a window where the attacker can manipulate the freed memory to redirect execution flow or corrupt system data structures, ultimately enabling privilege escalation. The vulnerability is particularly dangerous in enterprise environments where PPP connections are used for remote access, as it can be exploited by attackers who have already gained network credentials through other means.
Mitigation strategies for CVE-2025-50159 should focus on immediate patching of affected systems and implementation of network monitoring to detect anomalous EAP-TLS traffic patterns that might indicate exploitation attempts. System administrators should prioritize applying vendor-provided security updates that address the memory management issues within the PPP EAP-TLS implementation. Additionally, network segmentation and access controls should be strengthened to limit the potential impact of successful exploitation, while implementing intrusion detection systems that can monitor for suspicious memory access patterns or privilege escalation attempts. The vulnerability aligns with ATT&CK technique T1068 which covers local privilege escalation through the exploitation of software vulnerabilities, and T1566 which covers credential harvesting through network access. Organizations should also consider implementing network-based controls that limit the exposure of PPP services and ensure that only authorized endpoints can establish connections. Regular security assessments and vulnerability scanning should be conducted to identify systems that may be running vulnerable versions of the PPP implementation, while maintaining detailed audit logs of PPP authentication activities to aid in forensic analysis if exploitation occurs. The remediation process should include not only patching but also network configuration reviews to ensure that EAP-TLS implementations are properly secured against memory corruption attacks.