CVE-2025-62221 is a high-severity vulnerability affecting multiple versions of Microsoft Windows, including Windows 10 and Windows Server editions. This vulnerability allows authorized attackers to leverage a use after free condition in the Windows Cloud Files Mini Filter Driver to elevate privileges locally. With a CVSS score of 7.8, this vulnerability poses a significant risk to organizations as it can lead to unauthorized access and manipulation of system resources.
The exploitation status of CVE-2025-62221 is currently classified as critical, with known exploits available. Organizations utilizing affected versions should prioritize patching to mitigate the risk of exploitation. Given the nature of the vulnerability, which allows local privilege escalation, it is crucial for defenders to act promptly.
The urgency for remediation is high, as attackers may leverage this vulnerability to gain elevated privileges, potentially leading to further attacks on organizational infrastructure. Therefore, organizations should address this vulnerability in their patch cycle without delay.
In summary, CVE-2025-62221 presents a serious risk to systems running affected versions of Windows. Organizations must take immediate action to patch this vulnerability to protect their environments from potential exploitation.
Vulnerability Details
The official description of CVE-2025-62221 states that it involves a use after free in the Windows Cloud Files Mini Filter Driver, enabling an authorized attacker to elevate privileges locally. This vulnerability has been classified under CWE-416, which denotes use after free conditions.
With a CVSS score of 7.8, the severity is classified as high. This indicates that the vulnerability can have a significant impact on confidentiality, integrity, and availability, as it affects various Windows components.
The affected products include Windows 10 versions 1809, 21H2, 22H2, as well as Windows 11 versions 23H2, 24H2, 25H2, and Windows Server editions 2019, 2022, and 2025. This broad range of affected systems highlights the importance of prompt remediation.
The vulnerability was published on December 9, 2025, following an analysis that determined its exploitability and potential impacts.
Technical Analysis
The root cause of CVE-2025-62221 stems from improper memory management in the Windows Cloud Files Mini Filter Driver, which leads to a use after free condition. This allows attackers to exploit the system locally.
The attack vector for this vulnerability is local, meaning that an attacker must have access to the system to initiate the exploit. The attack complexity is classified as low, indicating that the exploit can be executed with minimal technical skill.
Privileges required for the exploit are low, meaning that an attacker does not need elevated access to exploit this vulnerability. User interaction is not required, increasing the risk of successful exploitation.
The impact on confidentiality, integrity, and availability is high, as an attacker gaining elevated privileges can access sensitive data, modify system settings, and potentially take control of the system.
Risk & Impact Analysis
Organizations face substantial risks with CVE-2025-62221, given its potential for local privilege escalation. The ability for an authorized attacker to elevate privileges can lead to unauthorized access to sensitive information and critical system functions, posing a significant threat to organizational integrity and security.
The blast radius for this vulnerability is extensive, affecting multiple versions of Windows across both consumer and enterprise environments. Organizations using any of the affected products should conduct a thorough risk assessment to understand the potential impact on their operations.
Given the CVSS score of 7.8 and the fact that it is included in the Known Exploited Vulnerabilities (KEV) catalog, organizations should prioritize remediation efforts immediately. Delaying action increases the likelihood of exploitation and potential data breaches.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
CVE-2025-62221 affects the following Microsoft Windows versions: Windows 10 (1809, 21H2, 22H2), Windows 11 (23H2, 24H2, 25H2), and Windows Server (2019, 2022, 2025). If version information is missing, organizations should assume that all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should prioritize applying the latest patches and updates from Microsoft to address CVE-2025-62221. If a patch is unavailable, consider implementing workarounds such as disabling the vulnerable driver or restricting user access to the affected systems.
Configuration hardening practices should also be reviewed to minimize exposure. Additionally, organizations should monitor their systems for any unusual behavior that may indicate exploitation attempts.
For comprehensive security assessments, organizations may consider utilizing penetration testing services to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should implement logging of system events related to driver loading and memory management to detect potential exploitation attempts. Monitoring for behavioral anomalies such as unexpected privilege escalations or unauthorized access attempts is crucial.
Additionally, network signatures and alerts should be configured to identify abnormal traffic patterns that may correlate with exploitation attempts. Regular audits of system configurations can help identify changes that could indicate compromise.
AppSecure Threat Intelligence Insight
CVE-2025-62221 highlights the ongoing challenges organizations face in securing their environments against local privilege escalation vulnerabilities. The increasing complexity of software systems often leads to such vulnerabilities, underscoring the need for continuous security assessments.
This vulnerability is a reminder of the importance of robust vulnerability management programs that proactively address security weaknesses. Organizations should take note of the potential for similar vulnerabilities in their systems and take strategic defensive actions to mitigate risks.
For further insights on vulnerability management, organizations can refer to the vulnerability management program design best practices. Additionally, organizations should stay updated on industry trends through resources like the penetration testing methodology guide, which can assist in identifying and remediating vulnerabilities.
Finally, organizations should consider engaging in red teaming services to simulate real-world attack scenarios and better prepare for potential threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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