CVE-2026-69862 in Windows
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Windows Wireless Wide Area Network Service allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds read within the Windows Wireless Wide Area Network (WWAN) service represents a critical memory safety flaw that compromises the integrity of system data access mechanisms. This specific defect occurs when the WWAN service, which manages cellular network connectivity on devices equipped with mobile broadband adapters, processes malformed or specially crafted input data without performing adequate boundary checks. In standard software operation, an out-of-bounds read happens when a program attempts to read memory at an address that lies outside the allocated buffer for a particular variable or object. Instead of triggering an immediate crash due to invalid access protection mechanisms, this specific implementation flaw allows the application to silently retrieve data from adjacent memory locations. This behavior is particularly dangerous because it does not necessarily cause a denial of service but rather facilitates unauthorized information disclosure, allowing sensitive contents of system memory to be leaked to the attacker.
From a technical perspective, the root cause lies in insufficient validation of input parameters passed to functions within the WWAN API or underlying driver interfaces. When an authorized user interacts with network configuration settings or triggers specific connection states, the service may allocate buffers based on expected data sizes but fail to verify that actual incoming data does not exceed these limits during parsing operations. Consequently, if a malicious actor can supply input that exceeds the intended buffer size, the read operation will spill over into neighboring memory regions. These adjacent regions often contain stack variables, heap metadata, or other sensitive information such as authentication tokens, cryptographic keys, or credentials stored in plaintext within process memory. The attacker leverages this discrepancy to extract data that was not intended for public consumption, effectively bypassing standard access controls through side-channel-like memory leakage rather than direct privilege escalation.
The operational impact of this vulnerability is primarily centered on confidentiality and potential downstream exploitation risks. While the initial exploit requires local authorization, meaning an attacker must already have valid credentials or physical access to a logged-in session, the consequences are severe for enterprise environments where sensitive corporate data resides in application memory. Disclosure of internal system structures can aid attackers in constructing more sophisticated exploits by revealing offsets for further attacks such as buffer overflows or return-oriented programming chains. Furthermore, exposure of network configuration details and authentication materials could allow an adversary to impersonate legitimate users on the WWAN interface or intercept subsequent communications if encryption keys are compromised. This aligns with Common Weakness Enumeration (CWE) category CWE-125, which defines out-of-bounds read errors as a significant class of memory corruption vulnerabilities that undermine data integrity and confidentiality.
In terms of threat modeling and detection frameworks, this vulnerability maps to the ATT&CK technique T1005, specifically Data from Local System, where adversaries collect sensitive information directly from local sources without remote access capabilities. The exploitation vector is classified as local with low complexity due to the requirement for user authentication, yet its severity remains high because of the potential for significant data exfiltration within trusted internal networks. Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Microsoft typically addresses such issues through cumulative security updates that correct the buffer boundary checks within the WWAN service components. Organizations should prioritize applying these patches to all endpoints with cellular connectivity capabilities. Additionally, implementing strict application control policies can restrict unauthorized execution of scripts or binaries that might attempt to trigger this vulnerability. Regular auditing of system logs for unusual memory access patterns and ensuring that least-privilege principles are enforced across user accounts further reduces the attack surface available to potential local attackers seeking to exploit this flaw.