CVE-2025-50164 in Windows
Summary
by MITRE • 08/12/2025
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability identified as CVE-2025-50164 represents a critical heap-based buffer overflow within the Windows Routing and Remote Access Service RRAS component. This flaw exists in the way the service processes certain network requests, specifically when handling incoming data packets that are processed through the routing protocols. The vulnerability affects systems running Windows Server operating systems where RRAS functionality is enabled and actively used for network routing operations. Attackers must possess valid authentication credentials to exploit this vulnerability, making it an authorized user privilege escalation vector rather than a completely open exploit. The heap-based nature of the buffer overflow indicates that the vulnerability occurs when the application attempts to write data beyond the allocated memory boundaries in the heap memory region, potentially leading to memory corruption that can be leveraged for code execution.
The technical exploitation of CVE-2025-50164 requires an attacker to establish a valid session with the target RRAS service and then craft malicious network packets that trigger the buffer overflow condition. When the RRAS service processes these malformed packets, the excessive data causes memory corruption in the heap allocation, which can be manipulated to overwrite critical function pointers or return addresses. This type of vulnerability falls under CWE-121 heap-based buffer overflow classification, which is particularly dangerous because it can lead to arbitrary code execution in the context of the RRAS service process. The exploitation typically occurs when the service attempts to parse routing information or network configuration data that exceeds the expected buffer size, creating a scenario where attacker-controlled data can overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple code execution, as the RRAS service typically runs with elevated privileges and has significant network access capabilities. Successful exploitation could allow an attacker to gain control over the routing decisions of the affected system, potentially enabling man-in-the-middle attacks, network segmentation bypasses, or complete network compromise. The vulnerability affects enterprise networks where RRAS is commonly deployed for remote access and routing services, making it particularly concerning for organizations with distributed network infrastructures. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and control communication through routing protocols, and T1068 for privilege escalation through service abuse. The network-based nature of the attack means that exploitation can occur without requiring physical access to the system, making it a significant threat vector for remote attackers with network access.
Organizations should implement immediate mitigations including applying the latest security patches from Microsoft, which address the heap overflow condition in the RRAS service implementation. Network segmentation and access controls should be strengthened to limit which systems can communicate with RRAS services, particularly in environments where the service is not essential. Monitoring for unusual routing protocol activity and malformed packet patterns can help detect potential exploitation attempts. System administrators should also consider disabling RRAS functionality if it is not required for business operations, as this eliminates the attack surface entirely. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies, as it requires legitimate network access to exploit and can be effectively mitigated through proper access controls and timely patch management. Regular security assessments of routing services and network infrastructure should be conducted to identify and remediate similar vulnerabilities in other network components.