CVE-2025-26672 in Windows
Summary
by MITRE • 04/08/2025
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 • 07/09/2025
The vulnerability identified as CVE-2025-26672 represents a critical buffer over-read flaw within the Windows Routing and Remote Access Service component that enables remote information disclosure attacks. This issue affects the core networking functionality of Windows operating systems and specifically targets the RRAS service which handles routing protocols and remote access connections. The vulnerability stems from improper input validation within the service's packet processing routines, where insufficient bounds checking allows maliciously crafted network packets to trigger memory access violations that expose sensitive data from adjacent memory regions.
This buffer over-read condition occurs when the RRAS service processes incoming network traffic containing malformed or specially constructed packets that exceed expected buffer boundaries. The flaw manifests during the parsing of routing information protocol messages or other network control packets that the service handles for remote access and routing functions. Attackers can exploit this vulnerability by sending crafted packets to systems running RRAS, potentially causing the service to read beyond allocated memory buffers and return confidential information from adjacent memory locations. The vulnerability is particularly concerning because it operates at the network protocol level and can be exploited remotely without authentication requirements, making it accessible to any attacker with network connectivity to the target system.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposed memory contents may contain sensitive data such as authentication credentials, system configuration details, routing tables, or other confidential information that could be leveraged for further attacks. This information exposure creates opportunities for attackers to conduct reconnaissance activities, map network topologies, identify system configurations, and potentially escalate privileges within the compromised network environment. The vulnerability affects multiple Windows versions including server editions that typically host RRAS services, making enterprise networks particularly vulnerable if these services are enabled and accessible over network interfaces. Organizations running remote access servers, VPN gateways, or systems handling routing functions are at heightened risk of exploitation.
Security professionals should prioritize immediate mitigation efforts including applying Microsoft security updates and patches released for this vulnerability, implementing network segmentation to restrict access to RRAS services, and monitoring network traffic for suspicious packet patterns that may indicate exploitation attempts. The vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and represents a significant risk under ATT&CK technique T1046 for network service enumeration and T1082 for system information discovery. Organizations should also consider disabling unnecessary RRAS functionality, implementing network access controls, and establishing robust monitoring procedures to detect potential exploitation attempts. Given the remote nature of the attack vector and the potential for privilege escalation through information disclosure, comprehensive network security assessments should be conducted to identify all systems running RRAS services and ensure proper patch management protocols are in place to prevent exploitation.