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CVE-2021-26855 Scanner

Detects 'Server-Side-Request-Forgery (SSRF)' vulnerability in Microsoft Exchange Server affects v. Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2019 Cumulative Update 8, Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 4, Microsoft Exchange Server 2016 Cumulative Update 15, Microsoft Exchange Server 2019 Cumulative Update 5, Microsoft Exchange Server 2019 Cumulative Update 6, Microsoft Exchange Server 2016 Cumulative Update 16, Microsoft Exchange Server 2019 Cumulative Update 7, Microsoft Exchange Server 2016 Cumulative Update 18.

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Short Info


Level

Critical

Single Scan

Single Scan

Can be used by

Asset Owner

Estimated Time

15 sec

Scan only one

Url

Source

-

Microsoft Exchange Server is a widely used email and calendaring system that businesses and organizations rely on for communication and collaboration. Introduced in 1996, the Exchange Server has since evolved into a comprehensive messaging platform, allowing users to manage contacts, tasks, and schedules all in one location. With the rise of remote work, the server has become even more critical in maintaining productivity and connectivity.

Among the several vulnerabilities that cybercriminals have been exploiting on Microsoft Exchange Servers, the CVE-2021-26855 is the most critical one. The vulnerability, which was discovered by Hafnium, a group linked to the Chinese government, is a server-side request forgery (SSRF) vulnerability. It occurs when a server can be tricked into making an unintended request to a remote server, which may give unauthorized access to its target.

When exploited, CVE-2021-26855 enables cybercriminals to remotely execute code on the Exchange Server. This flaw allows attackers to bypass authentication protocols, enabling them to gain access to sensitive data stored within the server. The attack chain starts with the exploitation of this vulnerability and can potentially lead to complete control of the Exchange Server, leak of sensitive data, and the installation of ransomware.

The Microsoft Exchange Server vulnerability disclosed by Hafnium has left many organizations vulnerable to attack. Luckily, there are proactive steps that system administrators can take to reduce the likelihood of a successful attack. Learning about vulnerabilities is critical in identifying potential risks and staying proactive in protecting assets. By utilizing securityforeveryone.com's advanced features, individuals can stay up-to-date on potential vulnerabilities and gain insights into ways to minimize risk. Stay safe, stay knowledgeable, and take action to secure your assets and data.

 

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