Microsoft Exchange and Active Directory Blog
Microsoft has released new security updates for Exchange Server 2016 and Exchange Server 2019 today. The security update closes the remote execution vulnerability CVE-2024-26198 with the severity level "Important". The vulnerability is not currently being actively exploited, but Microsoft recommends that the update is installed quickly. Click here to download the security update: After installing the March ... Read more
The critical vulnerability CVE-2024-21410 in Exchange Server, which was made public on February 13, 2024, is now being actively exploited. The vulnerability CVE-2024-21410 allows attackers to perform an NTLM relay attack (pass the hash). In this case, attackers can trick a client such as Outlook into logging on to a malicious relay in order to obtain the NTLM credentials. The ... Read more
Microsoft today released new security updates for Exchange Server 2016 and Exchange Server 2019. The update closes the remote execution vulnerability CVE-2023-36778 and provides a better solution for the vulnerability CVE-2023-21709 from August. There were problems with the August security update and the update was temporarily recalled. The update from October for CVE-2023-36434 ... Read more
Microsoft has recently officially supported HSTS (HTTP Strict Transport Security). However, HSTS is not activated by default and must therefore be activated by the user. But first a few words about HSTS and how it works. What is HSTS and how does it work? HTTP Strict Transport Security (HSTS) is a guideline ... Read more
After the first version of the security update was withdrawn by Microsoft, a bug-fixed version has now been released. According to initial reports, this update can now be installed on non-English Exchange servers without any problems. Click here to download the update: Microsoft has also published a list of instructions on the Exchange Team Blog: On non-English ... Read more
Microsoft has released new security updates for Exchange Server 2016 and 2019. The update fixes 6 vulnerabilities that are marked as important. In addition, further adjustments are necessary after installing the updates. There are currently no indications that the vulnerabilities are being exploited. Click here to download the updates: The following vulnerabilities are fixed: ... Read more
A reader, who wishes to remain anonymous, has kindly sent me his scripts and configuration for Let's Encrypt, HAProxy and Exchange 2019 in conjunction with Extended Protection so that I can publish them here. First of all, I would like to thank you very much, because I think this configuration (HAProxy as a reverse proxy for Exchange, certificates via Let's ... Read more
Nobert has informed me that Microsoft has updated the prerequisites for the installation of Exchange Server 2019 and 2016. The Windows feature Message Queuing (MSMQ) is no longer required and can be uninstalled from the Exchange servers. The two Windows features "Message Queuing (MSMQ) Activation" and "Message Queuing" are removed with the automatic installation of the ... Read more
Microsoft has released new security updates for Exchange Server 2016 and 2019. The update fixes two remote code execution vulnerabilities with a severity rating of "Important". Click here to download the updates: The vulnerabilities are not yet being actively exploited. However, the available updates should be installed as soon as possible. Click here for the article on the ... Read more
The following error often occurs after migrating an Exchange server. Outlook cannot download the offline address book with cache mode switched on and displays the following error message: "Error (0x8004010F) while executing the task: Error during operation. An object cannot be found." The error can occur if the address book was migrated to an offline ... Read more
