Our recommendation, as always, is to install the latest CU and SU on all your Exchange servers to ensure that you are protected against the latest threats.
EXCHANGE VERSIONS UPDATE
Any Exchange servers that are not on a supported CU and the latest available SU are vulnerable to ProxyShell and other attacks that leverage older vulnerabilities. Download Cumulative Update 12 for Exchange Server 2019 (KB5011156) from Official Microsoft Download Center Download Cumulative Update 12 for Exchange Server 2019 (KB5011156) from Official Microsoft Download Center Internet Explorer was retired on JIE 11 is no longer accessible. In all of the above scenarios, you must install one of latest supported CUs and all applicable SUs to be protected.
The server is running an older, unsupported CU, with the March 2021 EOMT mitigations applied.The server is running security updates for older, unsupported versions of Exchange that were released in March 2021 or.The server is running an older, unsupported CU (without May 2021 SU) Exchange schema versions (up to date list) Updated on November 16, 2022.Your Exchange servers are vulnerable if any of the following are true: Subscription entitles access to support, product updates, security and time zone patches. As we have said several times, it is critical to keep your Exchange servers updated with latest available Cumulative Update (CU) and Security Update (SU). Today we are announcing that the next versions of Exchange Server, SharePoint Server, Skype for Business Server and Project Server will be available in the second half of 2021, and are only available with the purchase of a subscription license. Exchange Online customers are also protected (but must make sure that all hybrid Exchange servers are updated).īut if you have not installed either of these security updates, then your servers and data are vulnerable. If you have installed the May 2021 security updates or the July 2021 security updates on your Exchange servers, then you are protected from these vulnerabilities. This past week, security researchers discussed several ProxyShell vulnerabilities, including those which might be exploited on unpatched Exchange servers to deploy ransomware or conduct other post-exploitation activities. Microsoft is now also updating Exchange Server 2010 for 'defense-in-depth purposes.' CVE-2021-26855: CVSS 9.1: a Server Side Request Forgery (SSRF) vulnerability leading to crafted HTTP requests.
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