CVE-2021-36955 is a high-severity elevation of privilege vulnerability found in the Microsoft Windows Common Log File System (CLFS) Driver. This vulnerability allows attackers to gain elevated privileges on affected systems, posing a significant risk to organizational security. The CVSS score of 7.8 indicates a high level of severity, making it imperative for organizations to take immediate action. With an exploitability score of 1.8 and a potential impact on confidentiality, integrity, and availability, the urgency for defenders is clear.
Organizations should prioritize patching immediately. The vulnerability was publicly disclosed on September 15, 2021, and has since been analyzed for its potential impact. Given its classification as an elevation of privilege vulnerability, successful exploitation could allow attackers to execute arbitrary code with elevated privileges, potentially compromising sensitive information and system integrity.
The urgency of addressing CVE-2021-36955 is underscored by its inclusion in the Known Exploited Vulnerabilities (KEV) catalog, indicating that it is actively being exploited in the wild. Security teams must remain vigilant and responsive to this threat, ensuring that all necessary patches and updates are applied promptly to safeguard their environments.
In summary, CVE-2021-36955 presents a significant risk to organizations utilizing affected Microsoft Windows products. Immediate action is required to mitigate the potential impact of this vulnerability, ensuring the continued security and integrity of their systems.
Vulnerability Details
CVE-2021-36955 is described as a Windows Common Log File System Driver Elevation of Privilege Vulnerability. It has a CVSS score of 7.8, categorizing it as high severity. The attack vector for this vulnerability is local, requiring low complexity and low privileges, with no user interaction needed. The vulnerability's impact is classified as high for confidentiality, integrity, and availability.
The affected products include various versions of Windows 10, Windows 7, Windows 8.1, and several Windows Server versions. The vulnerability was published on September 15, 2021, and has been analyzed thoroughly.
Technical Analysis
The root cause of CVE-2021-36955 lies in the Windows Common Log File System Driver, which fails to properly handle certain requests, allowing attackers to escalate privileges. The attack vector is local, meaning that an attacker must have physical or remote access to the affected system. The complexity of the attack is low, requiring minimal effort to exploit.
No user interaction is required for exploitation, making it easier for attackers to leverage this vulnerability. If successfully exploited, attackers could gain elevated privileges, leading to a high impact on confidentiality, integrity, and availability.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-36955 is substantial, given its potential for privilege escalation. Organizations that do not remediate this vulnerability may expose themselves to unauthorized access and data breaches, leading to severe reputational and financial damage.
The blast radius of this vulnerability is significant, as it affects several versions of Windows and Windows Server across diverse organizational environments. The urgency assessment is critical, as indicated by its inclusion in the KEV catalog and the known exploitation in the wild.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | Yes |
Affected Versions
CVE-2021-36955 affects multiple versions of Microsoft Windows, including Windows 10 (all versions prior to 10.0.19042.1237), Windows 7, Windows 8.1, Windows RT 8.1, and various Windows Server versions. Organizations should patch all affected systems to mitigate this vulnerability.
Mitigation & Remediation
To mitigate CVE-2021-36955, organizations should apply patches provided by Microsoft as soon as possible. For detailed guidance on updates, refer to the security update guidance. If patches are unavailable, organizations should implement configuration hardening and apply network controls to limit exposure to this vulnerability.
Detection Guidance
Organizations should monitor system logs for indicators of exploitation attempts, including unusual access patterns and unauthorized privilege escalations. Behavioral anomalies should be investigated promptly to detect potential exploitation of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-36955 highlights the importance of timely patching and robust security practices. This vulnerability serves as a reminder for security teams to prioritize vulnerability management and adapt to evolving threats. Organizations are encouraged to regularly review their security posture and implement comprehensive testing strategies, such as penetration testing and continuous monitoring to identify and mitigate risks effectively.
Security teams should also consider participating in threat intelligence sharing initiatives to stay informed about emerging vulnerabilities and attack trends. Implementing a proactive incident response plan will further enhance organizational resilience against exploitation attempts.
Finally, organizations should not overlook the importance of employee training and awareness programs, as human factors often play a significant role in successful attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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