CVE-2026-70579 in Windows
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Windows Mobile Broadband allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds read within the Windows Mobile Broadband component represents a critical memory safety flaw that compromises the confidentiality of system data. This specific type of error occurs when software attempts to access memory locations beyond the intended boundaries of a buffer or array, typically reading uninitialized or sensitive information stored in adjacent memory regions. In the context of Microsoft's networking stack, particularly components handling mobile broadband connections such as those used for cellular data interfaces, improper validation of input parameters allows an attacker to trigger this erroneous read operation. The flaw is rooted in how the system processes network packets or configuration requests related to mobile connectivity services, where boundary checks are either missing or incorrectly implemented during memory allocation and access routines.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration category CWE-125, which describes out-of-bounds read operations that can lead to information disclosure. The operational impact is significant because it enables an unauthorized attacker to exfiltrate sensitive system information over the network without requiring authentication or prior access privileges on the target machine. By exploiting this flaw, an adversary could potentially retrieve kernel-mode data, cryptographic keys, session tokens, or other private information residing in memory adjacent to the targeted buffer. This capability transforms a simple memory safety error into a potent tool for reconnaissance and further exploitation, as disclosed secrets can be leveraged to bypass security controls or facilitate lateral movement within a network environment.
The attack vector associated with this vulnerability is remote, meaning it does not require physical access or local user interaction on the target system. An attacker positioned on the same network segment or capable of sending crafted packets to the affected Windows device could trigger the out-of-bounds read condition. This characteristic places the vulnerability within the MITRE ATT&CK framework under techniques related to Collection and Exfiltration, specifically those involving memory scraping or unauthorized access to sensitive information via remote services. The ease of exploitation over a network increases the risk profile substantially, as automated scanning tools could potentially identify vulnerable systems by probing for specific triggers associated with mobile broadband stack processing logic.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Microsoft has addressed this issue through security updates that patch the underlying code in the Windows Mobile Broadband component, ensuring proper bounds checking is enforced during memory access operations. Administrators should prioritize applying these cumulative updates to all connected devices within their infrastructure. Additionally, network segmentation can help limit exposure by restricting direct access to systems running vulnerable versions of Windows from untrusted networks. Implementing strict firewall rules that filter inbound traffic related to mobile broadband services and monitoring for anomalous network activity indicative of exploitation attempts further reduces the attack surface. Regular vulnerability assessments and penetration testing should also be conducted to identify similar memory safety issues in other components before they can be exploited by malicious actors.