CVE-2025-53155 in Windows
Summary
by MITRE • 08/12/2025
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability identified as CVE-2025-53155 represents a critical heap-based buffer overflow within the Windows Hyper-V hypervisor implementation that enables local privilege escalation for authenticated attackers. This flaw exists in the memory management subsystem of Hyper-V, specifically within the hypervisor's handling of heap allocations during virtual machine operations. The vulnerability stems from insufficient bounds checking when processing certain memory operations that occur during virtual machine state transitions or resource management activities. Attackers with local access to a system running Hyper-V can exploit this weakness to overwrite adjacent heap memory regions, potentially leading to arbitrary code execution with elevated privileges. The heap overflow occurs when the hypervisor processes user-supplied data structures during virtual machine management operations, particularly affecting memory allocation patterns that are commonly used in hypervisor-to-guest communication channels.
The technical nature of this vulnerability aligns with CWE-122, which describes heap-based buffer overflow conditions where insufficient validation of buffer sizes allows attackers to write beyond allocated memory boundaries. This type of flaw typically occurs when developers fail to properly validate input parameters or when memory allocation functions do not adequately check for buffer overflows during heap operations. The operational impact of CVE-2025-53155 extends beyond simple privilege escalation as it provides attackers with the capability to gain SYSTEM-level access within the virtualized environment, potentially enabling them to compromise all virtual machines running on the affected host. The vulnerability is particularly concerning because Hyper-V is widely deployed across enterprise environments and cloud platforms, making the attack surface substantial. Exploitation requires an authenticated local account with access to the Hyper-V management interface or virtual machine console, which significantly lowers the barrier to entry compared to remote exploitation scenarios. The attack vector leverages legitimate Hyper-V APIs and management interfaces, making detection more challenging as malicious activities may appear as normal administrative operations.
From a threat modeling perspective, this vulnerability maps to several ATT&CK techniques including privilege escalation through kernel exploits and credential access via local account manipulation. The attack chain typically begins with an authenticated user gaining access to the system through legitimate means such as administrative accounts or compromised credentials. The attacker then utilizes the heap overflow to execute code within the Hyper-V context, which operates with elevated privileges due to the hypervisor's privileged execution model. This exploitation model aligns with ATT&CK tactic T1068 which covers local privilege escalation techniques, and T1547 which addresses registry run keys and startup folder modifications that could be used to maintain persistence after initial compromise. The vulnerability's impact is amplified in virtualized environments where a single compromised host can potentially affect multiple virtual machines, creating cascading security failures. Organizations using Hyper-V for cloud infrastructure or server virtualization are particularly at risk as the compromised host could serve as a foothold for broader network infiltration.
Mitigation strategies for CVE-2025-53155 should prioritize immediate patch application from Microsoft as the primary defense mechanism, particularly for systems running Hyper-V with administrative privileges. Network segmentation and access control measures should be implemented to limit local access to Hyper-V management interfaces, reducing the attack surface for potential exploitation attempts. System administrators should implement principle of least privilege for Hyper-V management accounts, ensuring that only necessary personnel have access to virtual machine management functions. Memory protection mechanisms such as heap randomization and address space layout randomization should be enabled to increase the difficulty of exploitation. Monitoring solutions should be configured to detect anomalous Hyper-V management activities, particularly those involving memory allocation patterns or virtual machine state changes that could indicate exploitation attempts. Security teams should also consider implementing hypervisor-level security features such as Hyper-V Secure Boot and virtual trusted platform module functionality to provide additional protection layers. Regular security assessments of virtualized environments should include vulnerability scanning for Hyper-V components and continuous monitoring for unauthorized access to hypervisor management interfaces. The vulnerability's classification as a local privilege escalation issue means that organizations should also review their local account security policies and implement multi-factor authentication for administrative access to Hyper-V systems.