CVE-2025-26667 in Windows
Summary
by MITRE • 04/08/2025
Exposure of sensitive information to an unauthorized actor 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-2025-26667 represents a critical information disclosure flaw within the Windows Routing and Remote Access Service component that enables unauthorized actors to access sensitive data through network communications. This vulnerability specifically affects the RRAS functionality that handles routing and remote access operations within Microsoft Windows environments, creating potential pathways for attackers to extract confidential information from systems that rely on these services for network connectivity and remote access management. The exposure occurs due to improper access controls and insufficient validation mechanisms within the service's network communication protocols.
The technical root cause of this vulnerability stems from inadequate authorization checks and information flow controls within the RRAS implementation. Attackers can exploit this weakness by crafting specific network requests that bypass normal access restrictions, allowing them to retrieve sensitive information such as authentication credentials, network configuration details, routing tables, or other privileged data that should remain protected within the system. This flaw operates at the network protocol level where the service fails to properly validate incoming requests or enforce appropriate access controls before responding to information requests. The vulnerability aligns with CWE-200, which specifically addresses the exposure of sensitive information to unauthorized actors, and demonstrates how inadequate input validation and access control mechanisms can create persistent security weaknesses.
The operational impact of CVE-2025-26667 extends beyond simple information disclosure, potentially enabling attackers to conduct reconnaissance activities that could lead to more severe compromise scenarios. An attacker who successfully exploits this vulnerability could gain insights into network topology, identify potential attack vectors, or obtain credentials that could facilitate lateral movement within the network. This information exposure creates opportunities for privilege escalation attacks, as the leaked data might include details about network infrastructure, user accounts, or system configurations that could be leveraged in subsequent phases of an attack. The vulnerability's network-based nature means that attackers could potentially exploit it from remote locations without requiring physical access to the target systems, making it particularly dangerous in enterprise environments where RRAS services are commonly deployed.
Organizations affected by this vulnerability should implement immediate mitigations including applying the latest security patches from Microsoft, configuring appropriate network segmentation to limit access to RRAS services, and implementing network monitoring to detect unusual information disclosure patterns. The ATT&CK framework categorizes this type of vulnerability under T1083 - File and Directory Discovery and T1567 - Exfiltration Over Web Service, indicating that attackers could use this weakness as part of broader reconnaissance and data extraction campaigns. Security teams should also consider implementing network access controls using firewalls and access control lists to restrict communication with RRAS services to only trusted network segments, while maintaining detailed audit logging to detect potential exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems running RRAS services that may be vulnerable to this type of information disclosure attack, ensuring comprehensive protection against both current and emerging threats targeting Windows routing and remote access functionality.