CVE-2019-0714 in Windows
Summary
by MITRE
A denial of service vulnerability exists when Microsoft Hyper-V Network Switch on a host server fails to properly validate input from a privileged user on a guest operating system. An attacker who successfully exploited the vulnerability could cause the host server to crash. To exploit the vulnerability, an attacker who already has a privileged account on a guest operating system, running as a virtual machine, could run a specially crafted application that causes a host machine to crash. The update addresses the vulnerability by modifying how virtual machines access the Hyper-V Network Switch.
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Analysis
by VulDB Data Team • 02/20/2026
The vulnerability identified as CVE-2019-0714 represents a critical denial of service weakness within Microsoft Hyper-V's Network Switch implementation that fundamentally compromises the stability of host server environments. This flaw specifically targets the validation mechanisms that govern input processing between guest operating systems and the Hyper-V Network Switch component, creating a pathway for malicious actors to disrupt critical infrastructure services. The vulnerability operates within the context of virtualized environments where guest VMs share host resources, making it particularly dangerous in cloud computing and enterprise data center deployments where Hyper-V serves as the primary virtualization platform. The issue stems from insufficient input validation routines that fail to properly sanitize or verify data received from privileged guest users, allowing malformed or specially crafted inputs to propagate through the network switching layer and ultimately trigger system crashes.
The technical exploitation of CVE-2019-0714 requires an attacker to first establish a privileged position within a guest operating system, typically through legitimate administrative access or successful exploitation of other vulnerabilities. Once positioned within the guest environment, the attacker can execute a carefully constructed application or binary that leverages the insufficient validation mechanisms in the Hyper-V Network Switch. This crafted input causes memory corruption or resource exhaustion within the host's network processing components, ultimately leading to system instability and complete service disruption. The vulnerability manifests as a direct result of the network switch's failure to implement proper boundary checking and input sanitization protocols, which are fundamental requirements in secure system design. The flaw specifically affects the communication channel between virtual machines and the host's network infrastructure, creating a vector through which a single compromised guest can potentially impact the entire host system's availability.
From an operational impact perspective, CVE-2019-0714 poses significant risks to organizations relying on Hyper-V virtualization platforms, particularly those operating mission-critical applications or services that depend on continuous availability. The vulnerability's potential to cause complete host server crashes means that service disruptions can affect multiple virtual machines simultaneously, leading to cascading failures across dependent systems. This denial of service scenario is particularly concerning in cloud environments where multiple tenants share the same physical infrastructure, as a single malicious guest could potentially disrupt services for all other virtual machines hosted on the same physical server. The impact extends beyond simple service interruption to include potential data loss, service degradation, and reputational damage for organizations that cannot guarantee system uptime. The vulnerability's exploitation requires minimal privileges compared to other attack vectors, making it accessible to attackers who may have legitimate administrative access to guest systems, thereby increasing the attack surface significantly.
The remediation for CVE-2019-0714 involves Microsoft's patch implementation that modifies the Hyper-V Network Switch's input validation mechanisms to properly sanitize all data received from guest operating systems. The update specifically addresses the validation routines by implementing stricter boundary checking and input sanitization protocols that prevent malformed data from causing host system crashes. Organizations should prioritize immediate deployment of this security update across all Hyper-V host environments, particularly in production systems where the vulnerability could be exploited to cause significant operational disruption. Security teams should also implement monitoring solutions to detect anomalous network behavior that might indicate attempted exploitation of this vulnerability. The fix aligns with industry best practices for secure coding standards and addresses the underlying CWE categories related to input validation failures and improper error handling in system components. This vulnerability demonstrates the critical importance of proper validation mechanisms in virtualization platforms and reinforces the need for comprehensive security testing of hypervisor components that directly interface with host resources, as outlined in the ATT&CK framework's methodology for identifying and mitigating virtualization-based attack vectors.