CVE-2026-20825 is classified as a medium-severity vulnerability due to improper access control in Microsoft Windows Hyper-V. The CVSS score for this vulnerability is 4.4, highlighting its potential impact on confidentiality. This vulnerability allows an authorized attacker to disclose information locally, which poses a risk to organizations relying on Windows Hyper-V for virtualization.
The risk to organizations includes unauthorized information disclosure, which could lead to further attacks or data breaches. Given its classification and potential impact, organizations should prioritize patching immediately to safeguard their systems.
Currently, there is no known public exploit for this vulnerability, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog. Nevertheless, the presence of such vulnerabilities necessitates immediate attention and remediation.
Organizations utilizing affected versions of Windows should be aware of the urgency surrounding this vulnerability and take necessary actions to mitigate risks.
Vulnerability Details
The vulnerability is characterized by improper access control in Windows Hyper-V, which allows authorized attackers to disclose information locally. The vulnerability is categorized under CWE-284, indicating issues with access control mechanisms.
The CVSS version 3.1 vector string for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N, resulting in a base score of 4.4. This reflects a local attack vector with low complexity and high privileges required, indicating that an attacker must have significant access to exploit the vulnerability.
The affected products include various versions of Windows 10 and Windows 11, as well as Windows Server 2019 and 2022. The details regarding affected versions are essential for organizations to identify and mitigate the risk.
Technical Analysis
The root cause of this vulnerability lies in the improper access control mechanisms within Windows Hyper-V. Attackers can leverage this flaw by gaining unauthorized access to sensitive information stored locally. The local attack vector allows exploitation without the need for user interaction.
The attack complexity is categorized as low, indicating that an attacker can exploit this vulnerability with minimal effort, provided they have the required privileges. The confidentiality impact is rated as high, meaning that sensitive information can be disclosed, while the integrity and availability impacts are rated as none.
Risk & Impact Analysis
The real-world deployment risk of this vulnerability is significant due to its ability to facilitate unauthorized information disclosure. Organizations must understand that this could lead to broader security implications, especially if sensitive data is involved.
Given the medium CVSS score and the nature of the vulnerability, organizations should assess their patching strategies and prioritize remediation efforts accordingly. The potential for significant implications highlights the importance of ongoing security assessments and vigilance.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Microsoft products are affected by CVE-2026-20825:
1. Windows 10 (versions 1809, 21H2, 22H2) prior to specific updates.
2. Windows 11 (versions 23H2, 24H2, 25H2) prior to specific updates.
3. Windows Server 2019 and 2022 (including 23H2 and 2025) prior to specific updates.
Mitigation & Remediation
Organizations should prioritize patching immediately. Ensure that all affected systems are updated to the latest versions provided by Microsoft to mitigate this vulnerability.
If a patch is unavailable, organizations may implement network controls to limit access to the impacted systems until the necessary updates can be applied.
Monitoring for any unusual activity on affected systems is also recommended to detect potential attempts to exploit this vulnerability.
For further details on penetration testing services, organizations can review our offerings for penetration testing to validate their security posture.
Detection Guidance
Monitoring logs for access attempts and reviewing behavioral anomalies can help in identifying potential exploitation of this vulnerability. Organizations should also look out for any unexpected changes in system configurations or user permissions.
AppSecure Threat Intelligence Insight
CVE-2026-20825 serves as a reminder of the importance of robust access controls within virtualization environments. Security teams should analyze the patterns of past vulnerabilities to understand and strengthen their defenses.
For further reading on vulnerability management best practices, organizations can refer to our insights on vulnerability management and strategies to enhance application security.
Additionally, organizations should keep abreast of emerging threats and vulnerabilities by following our penetration testing methodology articles.
For more insights into security trends, organizations are encouraged to review our 2026 ransomware targeting trends.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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