CVE-2025-21212 is classified as an Internet Connection Sharing (ICS) Denial of Service vulnerability, impacting various Microsoft Windows versions. With a CVSS score of 6.5, this medium-severity vulnerability poses significant risks to organizational operations, primarily affecting availability. Attackers may leverage this vulnerability to cause service disruptions, leading to potential downtime and loss of productivity.
The vulnerability was published on February 11, 2025, and has been assigned a CVSS v3.1 score of 6.5. This score reflects a high availability impact due to the nature of the Denial of Service potential. Given the critical nature of services often relying on ICS, organizations should prioritize patching immediately.
As of now, there are no known public exploits or proof of concept (PoC) available for this vulnerability, which indicates that it may not yet be actively exploited in the wild. Nevertheless, the potential for exploitation remains a concern, necessitating prompt action from organizations.
In summary, organizations should address this vulnerability in their priority patch cycle to mitigate risks associated with potential service disruptions.
Vulnerability Details
CVE-2025-21212 is described as an Internet Connection Sharing (ICS) Denial of Service Vulnerability. The CVSS score of 6.5 indicates a medium severity level, primarily due to its high availability impact. The vulnerability affects various versions of Microsoft Windows, including Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (22H2, 23H2, 24H2), and multiple Windows Server versions.
The vulnerability was published on February 11, 2025. It is classified under CWE-125, indicating an out-of-bounds read, which can lead to unexpected behavior. The affected systems require no privileges or user interaction for exploitation, and the attack vector is classified as adjacent network.
Technical Analysis
The root cause of CVE-2025-21212 lies in the handling of Internet Connection Sharing (ICS) features within Microsoft Windows. When an attacker exploits this vulnerability, they can trigger a Denial of Service condition, effectively disrupting connectivity for users relying on ICS functionality.
The attack vector for this vulnerability is classified as adjacent network, meaning that an attacker must be on the same network as the target to exploit the vulnerability. The attack complexity is low, as it does not require any special privileges or user interaction to trigger the denial of service condition.
The impacts on confidentiality and integrity are none; however, the availability impact is high, which means that the vulnerability can lead to significant service disruption.
Risk & Impact Analysis
Risk to organizations includes potential service disruption in environments using Internet Connection Sharing. The availability of systems may be severely impacted, leading to downtime, loss of productivity, and potential reputational damage.
Organizations should assess their use of ICS and implement necessary patches as part of their immediate remediation strategy. Given the high availability impact, it is critical for organizations to prioritize this vulnerability in their patch management processes.
With an EPS score of 0.0019, indicating a very low likelihood of exploitation, the urgency remains moderate. Organizations should schedule remediation but remain vigilant with monitoring for any signs of potential exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following versions of Microsoft Windows: Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (22H2, 23H2, 24H2), and Windows Server versions (2016, 2019, 2022, 2025). All versions prior to vendor patch are considered vulnerable.
Mitigation & Remediation
Organizations should implement available patches to remediate the vulnerability. It is recommended to upgrade to the latest versions of the operating systems indicated above. In cases where patches cannot be applied immediately, organizations should consider implementing configuration hardening and network controls to limit exposure.
For further guidance on effective patch management and remediation strategies, organizations can refer to the penetration testing services that help evaluate the security posture of their systems.
Detection Guidance
Organizations should monitor logs for indicators of abnormal connectivity patterns and any potential service disruptions associated with Internet Connection Sharing. Behavioral anomalies that suggest unauthorized attempts to disrupt ICS functionality should also be flagged.
AppSecure Threat Intelligence Insight
CVE-2025-21212 highlights the importance of maintaining robust patch management practices, especially for vulnerabilities that may disrupt availability. Organizations should strive to develop a comprehensive vulnerability management program that encompasses regular assessments, timely patching, and continuous monitoring.
This incident serves as a reminder that even vulnerabilities with low likelihood scores can have significant impacts. Security teams should take proactive measures to ensure they are prepared for potential future threats and vulnerabilities.
Organizations can enhance their security posture by engaging in regular penetration testing to identify and mitigate weaknesses before they can be exploited.
Lastly, organizations should stay informed about emerging vulnerabilities and trends in the cybersecurity landscape to adapt their strategies accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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