CVE-2025-21351 is classified as a high-severity vulnerability affecting Microsoft Windows Active Directory Domain Services. This vulnerability allows for a denial of service (DoS) attack, which could lead to significant disruptions in services that rely on Active Directory. The CVSS score of 7.5 indicates that this vulnerability poses a serious risk to organizations, particularly those with critical infrastructure relying on the affected services.
With the potential for high availability impact, organizations must understand the implications of this vulnerability. The attack vector is network-based, allowing attackers to exploit it remotely without requiring any privileges or user interaction. Given the low complexity of the attack, the risk to organizations includes service interruptions that could affect business operations.
Currently, there are no known exploits available in the wild, but the exploitability score of 3.9 indicates that it is feasible for attackers to develop one. Therefore, organizations should prioritize patching immediately. The vulnerability was published on February 11, 2025, and has been analyzed thoroughly, indicating a critical need for timely remediation.
In summary, organizations must take proactive measures to address CVE-2025-21351. Prioritizing patch deployment and understanding the nature of this vulnerability will be key in preventing potential service disruptions.
Vulnerability Details
The official description for CVE-2025-21351 states that it is a denial of service vulnerability within the Windows Active Directory Domain Services API. The CVSS score of 7.5 categorizes this vulnerability as high severity, primarily due to its potential impact on availability. It affects various versions of Microsoft Windows, including Windows 10 and Windows Server versions, specifically targeting multiple configurations up to specified version limits. The vulnerability was published on February 11, 2025, and is associated with CWE-400.
Technical Analysis
The root cause of CVE-2025-21351 stems from inadequate handling of requests by the Active Directory Domain Services API, which can be exploited to create a denial of service condition. The attack vector is network-based, meaning that no physical access is required to exploit the vulnerability. The attack complexity is low, as attackers do not need to possess any privileges or interact with users to execute the attack.
The potential impacts are significant, with high availability impact observed. Confidentiality and integrity are not affected, but the denial of service could lead to service outages, impacting organizational operations.
Risk & Impact Analysis
Real-world deployment of this vulnerability poses substantial risk to organizations. Effective exploitation could disrupt critical services relying on Active Directory, leading to significant operational challenges. The urgency to address this vulnerability is underscored by its CVSS score of 7.5, indicating a high-risk profile.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Microsoft Windows are affected by CVE-2025-21351: Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (22H2, 23H2, 24H2), and various versions of Windows Server (2016, 2019, 2022, 2025). Organizations using these versions should verify their systems against the specified version limits.
Mitigation & Remediation
To mitigate the risk associated with CVE-2025-21351, organizations should immediately apply the relevant patches provided by Microsoft. For those unable to patch, consider implementing network segmentation to limit exposure and monitor network traffic for unusual patterns. Configuration hardening and continuous security testing should also be prioritized to enhance overall security posture.
Detection Guidance
Organizations should monitor logs for indicators of denial of service attempts targeting Active Directory services. Look for unusual spikes in traffic or service requests that could indicate malicious activity. Additionally, employ behavioral anomaly detection to identify potential abuse of the Active Directory services API.
AppSecure Threat Intelligence Insight
CVE-2025-21351 reflects a growing trend in vulnerabilities related to denials of service in critical services. Organizations should evaluate their defenses against similar vulnerabilities, considering the potential for service disruptions. Adoption of a robust vulnerability management program will help in promptly addressing such vulnerabilities. For further insights, organizations can explore our vulnerability management program design strategies to enhance their security posture.
Furthermore, organizations should consider engaging in penetration testing to proactively identify and mitigate potential vulnerabilities in their infrastructures.
Lastly, organizations can benefit from continuous assessment methodologies, such as continuous penetration testing, to ensure their defenses remain resilient against evolving threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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