CVE-2026-87698 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in Windows Remote Access Service Infrastructure allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified within the Windows Remote Access Service Infrastructure represents a critical memory safety flaw classified as an out-of-bounds read, which corresponds directly to Common Weakness Enumeration identifier CWE-125. This specific type of error occurs when software attempts to read data from a memory location that lies outside the intended buffer boundary. In the context of remote access services, such as those handling VPN connections or dial-up networking protocols, precise memory management is paramount due to the high volume and complexity of packet processing involved. When an attacker interacts with these services by crafting specific network requests or manipulating connection parameters, they can trigger a condition where the application reads beyond the allocated buffer limits. This behavior indicates a failure in input validation or bounds checking routines that are responsible for ensuring data integrity during transmission handling processes.
The operational impact of this vulnerability centers on local information disclosure rather than remote code execution or denial of service. Because the flaw allows an authorized attacker to read memory contents outside the designated boundaries, it potentially exposes sensitive internal state information, cryptographic keys, session tokens, or other confidential data residing in adjacent memory regions. The requirement for authorization implies that a user must already possess valid credentials and access privileges on the affected system to exploit this condition. Consequently, while the attack vector is local, the consequences can be severe if the disclosed information aids in further privilege escalation attacks or compromises the confidentiality of ongoing secure sessions. This aligns with ATT&CK technique T1005, which describes Data from Local System Retrieval, highlighting how attackers leverage system flaws to gather intelligence without necessarily breaking into the network perimeter directly.
Mitigation strategies for this vulnerability primarily involve applying the latest security patches released by Microsoft, as these updates typically include code modifications that enforce strict bounds checking and improve memory management practices within the Remote Access Service components. Administrators should ensure that all systems running affected versions of Windows are updated promptly to close the gap between expected behavior and actual execution flow. Additionally, implementing defense-in-depth measures such as restricting administrative access, enforcing multi-factor authentication for remote connections, and monitoring for unusual patterns in local system calls can help detect potential exploitation attempts before significant data exfiltration occurs. Regular auditing of user privileges ensures that only necessary accounts have the ability to interact with sensitive network services, thereby reducing the attack surface available to internal threats or compromised credentials.