CVE-2025-27474 in Windows
Summary
by MITRE • 04/08/2025
Use of uninitialized resource in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to disclose information over a network.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 04/08/2025
The vulnerability in question represents a critical security flaw within the Windows Routing and Remote Access Service that stems from improper initialization of system resources during network communication processing. This issue specifically affects the remote access functionality that enables routing services across network boundaries, creating a pathway for malicious actors to exploit uninitialized memory segments. The problem manifests when RRAS processes incoming network requests without properly validating or initializing required system components, leading to potential information disclosure through network channels.
This vulnerability aligns with CWE-457 which defines "Use of Uninitialized Variable" as a fundamental programming error where variables are used before being properly initialized. The flaw operates at the protocol processing layer within RRAS, particularly affecting how the service handles authentication and routing requests from remote clients. When an attacker sends malformed or unexpected network traffic to a vulnerable RRAS instance, the uninitialized resources can be accessed and potentially reveal sensitive information about the system's internal state, memory layout, or configuration parameters.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with valuable reconnaissance data that can be leveraged for subsequent attacks. An unauthorized network entity could exploit this weakness to gather system fingerprints, routing table information, or other sensitive metadata that would normally remain protected within the secure boundaries of the RRAS service. The attack surface is particularly concerning given that RRAS services are often deployed in enterprise environments where they serve as critical network infrastructure components for remote access and connectivity management.
From an adversary perspective, this vulnerability maps directly to ATT&CK technique T1082 which covers system information discovery through network-based reconnaissance activities. Attackers could utilize this flaw to build comprehensive profiles of target networks, identifying potential attack vectors and system configurations that would otherwise remain hidden from standard scanning techniques. The network-based nature of the exploit means that attackers do not require physical access or local system privileges to leverage this vulnerability effectively.
Mitigation strategies should focus on immediate patch deployment through Microsoft's regular security updates, which address the uninitialized resource handling within RRAS components. Organizations must also implement network segmentation and access controls to limit exposure of RRAS services to untrusted networks. Additional defensive measures include monitoring for unusual traffic patterns targeting routing services, implementing strict firewall rules that restrict RRAS communication to authorized endpoints only, and conducting regular vulnerability assessments to identify any remaining instances of the vulnerable service configuration. Network administrators should also consider disabling unnecessary RRAS features and regularly reviewing service configurations to minimize potential attack surfaces while maintaining required connectivity functions.