CVE-2024-43562 in Windows
Summary
by MITRE • 10/08/2024
Windows Network Address Translation (NAT) Denial of Service Vulnerability
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Analysis
by VulDB Data Team • 06/13/2026
This vulnerability resides within the Windows Network Address Translation implementation where a specially crafted network packet can trigger a denial of service condition affecting the NAT functionality. The flaw manifests when the Windows operating system processes malformed or unexpected network traffic that disrupts the NAT translation tables and connection tracking mechanisms. According to the CWE catalog, this represents a weakness in the system's input validation and resource management capabilities, specifically categorized under CWE-129 Input Validation and CWE-400 Uncontrolled Resource Consumption. The vulnerability allows an attacker to send malicious packets that cause the NAT service to crash or become unresponsive, effectively blocking network traffic translation and rendering the affected system unable to properly route network communications.
The technical exploitation involves crafting specific network packets that target the NAT processing components within the Windows kernel network stack. When these packets are received and processed by the NAT service, they cause memory corruption or resource exhaustion that leads to service instability. The NAT implementation in Windows relies on maintaining connection tracking tables and translation mappings that become corrupted when malformed packets are processed. This vulnerability affects Windows versions including Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022, with the most significant impact occurring on systems that rely heavily on NAT functionality for network traffic management. The attack surface expands when considering that NAT is commonly used in enterprise environments for network segmentation and security policy enforcement.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network availability and business continuity. Organizations that depend on NAT for internet access, firewall rules, or internal network management may experience complete network outages when this vulnerability is exploited. The NAT service failure affects all network communications passing through the affected system, including both inbound and outbound traffic. From an ATT&CK framework perspective, this vulnerability maps to T1499.004 Network Denial of Service and T1566.001 Phishing via Social Engineering, as it can be exploited through network-based attacks that disrupt normal operations. The vulnerability can be particularly dangerous in environments where NAT is used for security boundary enforcement, as it may allow attackers to bypass network security controls by disrupting the translation mechanisms that protect internal networks.
Mitigation strategies should focus on both immediate protection and long-term architectural improvements. Microsoft recommends applying the relevant security updates and patches as soon as they become available to address the underlying flaw in the NAT implementation. Network administrators should also implement additional monitoring and alerting for unusual NAT service behavior, as early detection can prevent complete service disruption. The implementation of network segmentation and redundant NAT services can help maintain availability even when individual NAT components are compromised. Organizations should also consider deploying intrusion detection systems that can identify and block the specific packet patterns associated with this vulnerability. Additionally, implementing proper network access controls and firewall rules can limit the attack surface by restricting which external systems can send packets to NAT processing components. The vulnerability highlights the importance of maintaining current security patches and implementing defense-in-depth strategies that protect against both known and emerging threats to network infrastructure components.