On February 11, 2025, Microsoft disclosed a high-severity vulnerability identified as CVE-2025-21375. This vulnerability allows for privilege escalation within the Kernel Streaming WOW Thunk Service Driver, a critical component of the Windows operating system. With a CVSS score of 7.8, this vulnerability poses a significant risk to organizations that utilize affected versions of Windows.
The vulnerability's attack vector is local, indicating that an attacker must have access to the system to exploit it. The attack complexity is low, requiring minimal technical skill. Additionally, the vulnerability has a high impact on confidentiality, integrity, and availability, making it imperative for organizations to address it swiftly.
Currently, there are no known exploits for this vulnerability, nor is it included in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should remain vigilant as the potential for exploitation exists, especially given the nature of privilege escalation vulnerabilities.
Organizations should prioritize patching immediately to mitigate the risks associated with CVE-2025-21375. Implementing the latest security updates from Microsoft is essential to protect systems from potential attacks.
Vulnerability Details
The CVE-2025-21375 vulnerability is categorized as a privilege escalation issue within the Kernel Streaming WOW Thunk Service Driver, which is part of various Microsoft Windows components, including Windows 10 and Windows Server editions. The vulnerability was published on February 11, 2025, with an official description highlighting its severe nature.
The CVSS score of 7.8 signifies a high level of severity, indicating that organizations need to take immediate action. The vulnerability affects multiple versions of Windows, including Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2), Windows 11 (22H2, 23H2, 24H2), and various Windows Server editions.
The relevant CWE classifications for this vulnerability include CWE-20 (Improper Input Validation) and CWE-122 (Heap-based Buffer Overflow), which suggest that improper validation mechanisms may have led to the vulnerability's existence.
Technical Analysis
The root cause of CVE-2025-21375 lies within the Kernel Streaming WOW Thunk Service Driver, where the lack of sufficient input validation may allow for arbitrary code execution. Attackers may leverage this vulnerability to escalate their privileges, gaining unauthorized access to sensitive system resources.
The attack vector is local, meaning an attacker must have physical or remote access to the system to exploit this vulnerability. The attack complexity is rated as low, indicating that even attackers with limited expertise could potentially exploit this vulnerability if they gain access to the system.
Furthermore, the attack requires low privileges, which adds to the risk, as a standard user may be able to exploit the vulnerability without needing elevated permissions. The lack of user interaction required to trigger the vulnerability enhances its exploitability.
The impacts of a successful exploitation include high confidentiality, integrity, and availability impacts. Organizations could face data breaches, service interruptions, and other serious security incidents if this vulnerability is exploited.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive data and critical system functionalities, leading to severe operational disruptions. The blast radius of this vulnerability is extensive, as it affects multiple Windows operating systems, making it a significant concern for enterprises using Microsoft products.
Given the high CVSS score and the nature of privilege escalation vulnerabilities, organizations must assess their exposure and prioritize remediation efforts. The urgency for addressing CVE-2025-21375 is high due to the potential impacts on business continuity and data integrity.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
CVE-2025-21375 affects several versions of Microsoft Windows, including:
Windows 10 (1507, 1607, 1809, 21H2, 22H2), Windows 11 (22H2, 23H2, 24H2), and multiple Windows Server editions (2008, 2012, 2016, 2019, 2022, 2025). If version information is missing, it is stated that all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should prioritize patching immediately. Microsoft provides updates to address CVE-2025-21375, and it is essential to apply these updates as soon as possible. For systems where a patch is unavailable, organizations may consider implementing configuration hardening and monitoring controls to mitigate the risk.
Additionally, organizations can benefit from conducting penetration testing to identify potential vulnerabilities and improve their security posture.
Detection Guidance
Monitoring for unusual behaviors and changes in system configurations can help in early detection of potential exploitation attempts. Organizations should focus on log indicators that highlight unauthorized access and unexpected privilege escalations. Network signatures may also assist in identifying malicious activities tied to this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2025-21375 underscores the continuing need for organizations to maintain robust security practices. With the increasing prevalence of privilege escalation vulnerabilities, security teams should regularly audit their systems and ensure timely application of patches.
This incident represents a broader trend where attackers seek to exploit local vulnerabilities to gain higher privileges. Organizations should implement a comprehensive penetration testing methodology to proactively identify and remediate such vulnerabilities.
In addition, fostering a security-aware culture within organizations can aid in minimizing risks associated with vulnerabilities like CVE-2025-21375. Regular training and awareness programs are key to keeping security at the forefront of organizational priorities.
Lastly, organizations may also consider examining their incident response plans to ensure they are equipped to handle potential exploitations of high-severity vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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