CVE-2025-53796 in Windows
Summary
by MITRE • 09/09/2025
Buffer over-read in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 11/03/2025
The vulnerability identified as CVE-2025-53796 represents a critical buffer over-read condition within the Windows Routing and Remote Access Service component that enables remote information disclosure attacks. This flaw exists in the RRAS functionality that manages network routing and remote access capabilities across Windows Server environments. The issue manifests when the service processes specific network requests that trigger improper memory handling, leading to unauthorized data exposure. The vulnerability impacts systems running Windows Server versions that include the RRAS service, particularly those configured for remote access scenarios such as VPN gateways and network routing services. Attackers can exploit this condition by sending specially crafted network packets to the affected RRAS service, causing it to read beyond allocated memory boundaries and potentially expose sensitive information from adjacent memory regions.
The technical implementation of this vulnerability falls under the category of memory safety issues commonly classified as CWE-125: "Out-of-bounds Read" within the Common Weakness Enumeration framework. This weakness specifically describes scenarios where a program reads data from memory locations beyond the intended buffer boundaries, often resulting in information disclosure or potential system instability. The flaw occurs within the network protocol handling logic of RRAS, where input validation and buffer size checking mechanisms fail to properly constrain data processing. The buffer over-read condition allows attackers to potentially extract memory contents including but not limited to authentication credentials, system configuration details, network topology information, and other sensitive data that may be stored in adjacent memory locations. This represents a significant concern for enterprise environments where RRAS services are commonly deployed for remote access and network routing functions.
From an operational perspective, this vulnerability poses substantial risk to organizations relying on Windows Server infrastructure for remote access capabilities. The remote exploitation nature means attackers can target affected systems from outside the network perimeter without requiring local access or authentication credentials. The information disclosure impact could lead to compromise of network security controls, exposure of internal network structures, and potential credential harvesting that could facilitate further attacks. Organizations running RRAS services in production environments face immediate risk of unauthorized data access, particularly those with VPN configurations or network routing services exposed to the internet. The vulnerability's exploitation does not require elevated privileges, making it particularly dangerous as it can be leveraged by attackers with minimal initial access. Security teams must consider the potential for this vulnerability to serve as a stepping stone for more sophisticated attacks, including lateral movement within networks or privilege escalation attempts.
Mitigation strategies for CVE-2025-53796 should prioritize immediate patch deployment from Microsoft as the primary defense mechanism. Organizations should implement network segmentation to isolate RRAS services from external exposure and restrict access to these services through firewall rules and access control lists. Monitoring network traffic for unusual patterns or malformed packets targeting RRAS services can help detect exploitation attempts. Security teams should conduct comprehensive vulnerability assessments to identify all systems running RRAS services and evaluate their exposure levels. The ATT&CK framework categorizes this vulnerability under T1046: "Network Service Scanning' and T1005: 'Data from Local System' as exploitation techniques that could be employed by adversaries. Organizations should also consider implementing intrusion detection systems to monitor for potential exploitation attempts and establish incident response procedures for handling information disclosure events. Regular security updates and patch management processes should be strengthened to ensure timely deployment of security fixes for similar vulnerabilities in the future. The vulnerability highlights the importance of maintaining up-to-date security controls and demonstrates the critical need for continuous monitoring of network services that handle external communications.