Over the past year, several vulnerabilities have been discovered in Exchange Server, the popular email and collaboration platform developed by Microsoft. These vulnerabilities have highlighted the critical importance of keeping systems patched and regularly testing those patches. In this article, we will provide a table summarizing the Exchange Server vulnerabilities from the past year and discuss why it is crucial to maintain a proactive approach to system security.

Exchange Server Vulnerabilities in the Last Year

VulnerabilityDescriptionSeverityPatch Release Date
CVE-2021-26855Server-side request forgery (SSRF) vulnerability that allows an attacker to send arbitrary HTTP requests and steal sensitive information.CriticalMarch 2, 2021
CVE-2021-26857Insecure deserialization vulnerability that allows remote code execution, enabling an attacker to take control of the server.CriticalMarch 2, 2021
CVE-2021-26858Security feature bypass vulnerability that allows an attacker to bypass authentication and gain unauthorized access to the Exchange Server.ImportantMarch 2, 2021
CVE-2021-27065Remote code execution vulnerability that allows an attacker to execute arbitrary code on the Exchange Server.CriticalMarch 2, 2021

The Importance of Keeping Systems Patched

Exchange Server vulnerabilities can have severe consequences if left unpatched. These vulnerabilities can be exploited by malicious actors to gain unauthorized access, steal sensitive information, or even take control of the server. Patching is the process of applying updates and fixes released by software vendors to address these vulnerabilities.

Here are a few reasons why keeping systems patched is crucial:

  • Security: Patching helps protect systems from known vulnerabilities, reducing the risk of exploitation by cybercriminals.
  • Compliance: Many industries and regulatory bodies require organizations to maintain up-to-date software and apply patches promptly.
  • Stability: Patches often include bug fixes and performance improvements, enhancing the stability and reliability of the system.
  • Data Protection: Patching helps safeguard sensitive data stored within the Exchange Server, preventing unauthorized access and potential data breaches.

The Importance of Testing Patches

While patching is crucial, it is equally important to test patches before deploying them to production systems. Testing helps ensure that the patches do not introduce new issues or conflicts with existing software or configurations. Here are a few reasons why testing patches is essential:

  • Compatibility: Testing allows organizations to identify any compatibility issues between the patch and their specific environment, preventing potential disruptions.
  • Performance Impact: Patches may have an impact on system performance. Testing helps organizations evaluate the performance impact and make necessary adjustments.
  • Functionality: Testing ensures that the patched system continues to function correctly and that critical features and functionalities are not affected.
  • Rollback Plan: In case a patch causes unexpected issues, testing provides an opportunity to develop a rollback plan to revert to the previous state if necessary.


The table above highlights some of the Exchange Server vulnerabilities discovered in the past year. It is crucial for organizations to prioritize patching and testing to protect their systems from potential exploitation. By staying up-to-date with patches and thoroughly testing them, organizations can significantly reduce the risk of security breaches, maintain compliance, and ensure the stability and functionality of their Exchange Server environments.

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