Integer Underflow in Microsoft Windows Hyper-V Network Services

CVE-2025-62567

What is CVE-2025-62567?

CVE-2025-62567 is a vulnerability affecting Microsoft Windows Hyper-V, a virtualization technology that allows multiple operating systems to run concurrently on a host machine. This specific vulnerability is classified as an integer underflow issue, which occurs when a calculation results in a number that is lower than the minimum representable value in integer arithmetic, leading to potential unintended behaviors. An attacker with authorized access could exploit this vulnerability to execute denial-of-service (DoS) attacks against network services, negatively impacting availability and disrupting service continuity. This poses a significant risk for organizations relying on Hyper-V for their virtualization needs, as service interruptions can affect critical applications and overall productivity.

Potential impact of CVE-2025-62567

1. Denial of Service (DoS): The primary consequence of this vulnerability is the potential for attackers to cause service disruptions within the Hyper-V environment. This can incapacitate virtual machines and associated network services, leading to critical downtime for users and applications.

2. Compromised Network Security: By exploiting this vulnerability, authorized attackers could manipulate network service behaviors, potentially creating openings for further exploitation or attacks down the line, thereby compromising the integrity of the system.

3. Increased Operational Costs: Organizations affected by this vulnerability may incur significant costs related to incident response, recovery efforts, and potential loss of revenue due to service outages. Additionally, addressing the vulnerability through patches and upgrades may require dedicated resources and time, adding to the operational burden.

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