CVE-2021-33766 Explained : Impact and Mitigation
Get insights into CVE-2021-33766, an Information Disclosure vulnerability in Microsoft Exchange Server. Learn about its impact, affected systems, and mitigation steps to secure your systems.
A detailed overview of the Microsoft Exchange Server Information Disclosure Vulnerability.
Understanding CVE-2021-33766
This section provides insights into the impact and technical details of CVE-2021-33766.
What is CVE-2021-33766?
The CVE-2021-33766 is an Information Disclosure vulnerability in Microsoft Exchange Server, which could allow an attacker to access sensitive information.
The Impact of CVE-2021-33766
The impact of this vulnerability is rated as 'HIGH' with a CVSS v3.1 base score of 7.3. If exploited, it could lead to unauthorized disclosure of sensitive data.
Technical Details of CVE-2021-33766
Explore the vulnerability description, affected systems, and exploitation mechanism below.
Vulnerability Description
The vulnerability exists in Microsoft Exchange Server, allowing attackers to disclose sensitive information.
Affected Systems and Versions
- Microsoft Exchange Server 2019 CU9: Version 15.02.0 with build less than 15.02.0858.010
- Microsoft Exchange Server 2016 CU20: Version 15.01.0 with build less than 15.01.2242.008
- Microsoft Exchange Server 2013 CU23: Version 15.00.0 with build less than 15.00.1497.015
- Microsoft Exchange Server 2016 CU19: Version 15.01.0 with build less than 15.01.2176.012
- Microsoft Exchange Server 2019 CU8: Version 15.02.0 with build less than 15.02.0792.013
Exploitation Mechanism
The vulnerability can be exploited by remote attackers with network access to the vulnerable system.
Mitigation and Prevention
Learn how to mitigate the risks associated with CVE-2021-33766 and prevent potential exploitation.
Immediate Steps to Take
- Apply security updates provided by Microsoft for the affected Exchange Server versions.
- Monitor systems for any suspicious activities indicating exploitation.
Long-Term Security Practices
- Regularly patch and update all software and systems to protect against known vulnerabilities.
- Implement network segmentation and access controls to limit exposure to threats.
Patching and Updates
Ensure timely installation of security patches and updates released by Microsoft to address the CVE-2021-33766 vulnerability.