CVE-2025-50163 in Windows
Summary
by MITRE • 08/12/2025
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability identified as CVE-2025-50163 represents a critical heap-based buffer overflow within the Windows Routing and Remote Access Service component that poses significant security risks to enterprise networks. This flaw exists in the processing of network packets within the RRAS functionality, specifically affecting systems that utilize routing protocols or remote access capabilities. The vulnerability manifests when the service handles malformed or specially crafted network traffic that exceeds allocated memory buffers, creating conditions where attacker-controlled data can overwrite adjacent memory regions. Such an issue fundamentally compromises the memory integrity of the affected system, providing potential entry points for malicious actors to gain unauthorized access and execute arbitrary code.
The technical nature of this vulnerability aligns with CWE-121, heap-based buffer overflow, which occurs when programs write data beyond the boundaries of heap-allocated buffers. In the context of RRAS, this typically involves network protocol parsing where incoming packets are processed without adequate bounds checking. The service's handling of routing updates, remote access authentication requests, or network discovery protocols creates multiple potential attack vectors where malicious input can trigger the buffer overflow condition. When memory corruption occurs, it can lead to stack pointer corruption, return address modification, or overwriting of critical function pointers, all of which enable attackers to redirect execution flow and ultimately achieve code execution.
The operational impact of CVE-2025-50163 extends beyond simple privilege escalation, as it provides attackers with persistent access to network infrastructure that serves as a foundation for lateral movement and data exfiltration. Organizations running RRAS services on Windows systems face immediate risk of compromise, particularly in environments where these services are exposed to untrusted networks or where legacy configurations exist. The vulnerability's network-based exploitation model means that attackers do not require local access or credentials to initiate attacks, making it particularly dangerous in perimeter defense scenarios. Once successful, the code execution capability allows adversaries to establish persistent backdoors, deploy additional malware, or use the compromised system as a launch point for attacks against other network segments.
From a threat modeling perspective, this vulnerability maps directly to ATT&CK technique T1059.007 for command and scripting interpreter, where attackers can leverage the executed code to establish persistent access. The attack chain typically involves reconnaissance of exposed RRAS services, crafting malicious network packets that trigger the buffer overflow, and subsequently deploying malicious payloads that exploit the compromised service. Organizations should prioritize immediate patching of affected systems, network segmentation to isolate RRAS services, and implementation of intrusion detection systems to monitor for suspicious network traffic patterns. Additionally, security teams should conduct comprehensive vulnerability assessments of all Windows systems that may be running RRAS functionality and review network access controls to minimize exposure of these services to external networks. The remediation strategy must include not only applying security patches but also implementing network monitoring to detect exploitation attempts and establishing incident response procedures to address potential compromise scenarios.