CVE-2025-21335 is a high-severity vulnerability identified in Microsoft Windows Hyper-V, specifically affecting versions of Windows 10 and 11, as well as Windows Server 2022 and 2025. This vulnerability allows local attackers to elevate their privileges, potentially leading to unauthorized access to sensitive system resources. The CVSS score for this vulnerability is 7.8, indicating a significant risk to organizations that utilize the affected products.
The risk to organizations includes the potential for attackers to gain SYSTEM privileges, which can lead to further exploitation of the system or network. As such, this vulnerability should be treated as a high priority for remediation. It is critical for organizations to understand the implications of this vulnerability and to take appropriate action.
Currently, there are no known exploits in the wild, but the vulnerability has been included in the Known Exploited Vulnerabilities (KEV) catalog, highlighting its potential risk. Organizations should prioritize patching immediately to mitigate this vulnerability and protect their systems.
Given the significant impact this vulnerability could have on an organization, it is essential to implement necessary patches and updates as soon as they are available. Vulnerable systems include Windows 10 versions 21H2 and 22H2, Windows 11 versions 22H2, 23H2, and 24H2, as well as Windows Server 2022 and 2025.
Organizations must remain vigilant and proactive in addressing this vulnerability to ensure the security and integrity of their systems.
Vulnerability Details
The official description for CVE-2025-21335 states that it is a Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability. The vulnerability exists due to improper handling of objects in memory, leading to the possibility of a use-after-free condition.
The vulnerability has a CVSS score of 7.8, indicating a high severity level. This score is derived from various factors, including the attack vector, attack complexity, and impact on confidentiality, integrity, and availability.
The affected products include Windows 10 versions 21H2 and 22H2, Windows 11 versions 22H2, 23H2, and 24H2, as well as Windows Server 2022 and 2025. The vulnerability was published on January 14, 2025, and has been assigned the CWE classification CWE-416.
Technical Analysis
The root cause of CVE-2025-21335 is a use-after-free vulnerability in the Windows Hyper-V component. This occurs when the system fails to properly manage the lifecycle of an object, leading to a situation where an attacker can exploit the flaw to gain elevated privileges.
The attack vector for this vulnerability is local, meaning an attacker must have access to the system to exploit it. The attack complexity is rated as low, and the required privileges for exploitation are also low. User interaction is not required for exploitation, making this a concerning vulnerability.
In terms of impact, the vulnerability could lead to high confidentiality, integrity, and availability impacts, as attackers may be able to access sensitive information, modify system data, or disrupt services.
Risk & Impact Analysis
The real-world risk associated with CVE-2025-21335 is significant, particularly for organizations that rely heavily on Microsoft Windows platforms. If exploited, attackers could gain SYSTEM privileges, allowing them to execute arbitrary code, access sensitive data, and potentially escalate their attacks further.
Organizations must recognize the blast radius potential of this vulnerability, as it can affect not just individual systems but could also lead to widespread impacts across networks and services.
Given the CVSS score and its presence in the KEV catalog, organizations should assess the urgency of remediating this vulnerability. The critical exploitability score indicates that this should be addressed as a priority.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions include Windows 10 versions 21H2 and 22H2, Windows 11 versions 22H2, 23H2, and 24H2, as well as Windows Server 2022 and 2025. Organizations should ensure that they are running the latest versions to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
Organizations must prioritize patching to remediate this vulnerability. Microsoft has provided updates to address this issue, and organizations should apply these updates as soon as possible.
Additionally, organizations should implement security hardening and monitoring practices to detect any suspicious activity related to this vulnerability. For further guidance, organizations can refer to the penetration testing services offered by AppSecure to validate the effectiveness of their security measures.
Detection Guidance
Organizations should monitor logs for any unusual activities that may indicate exploitation attempts. Behavioral anomalies and network signatures associated with privilege escalation should be closely observed.
AppSecure Threat Intelligence Insight
CVE-2025-21335 represents a critical vulnerability that highlights the importance of maintaining up-to-date systems and the need for robust security practices. The presence of this vulnerability in the KEV catalog underscores its potential impact and the necessity for immediate action.
Security teams should leverage this incident to review and strengthen their security posture, ensuring that they are prepared to address similar vulnerabilities in the future. For additional resources, organizations can explore the following guides:
Penetration testing methodology and vulnerability management program design to enhance their security strategies.
Through proactive measures and continuous improvement, organizations can effectively minimize the risk associated with vulnerabilities like CVE-2025-21335.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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