URGENT:
Microsoft released information this morning about a critical security vulnerability affecting Microsoft Outlook, and we want to make sure you are aware of it. This is a very serious vulnerability that is already be exploited “in the wild.” The Outlook email clients listed below are affected.
Microsoft identifies this vulnerability as CVE-2023-23397 and it is classified as a CRITICAL threat. This vulnerability allows a remote person to take over your system/access by simply sending you an email, which you view in your Outlook desktop application. You don’t even need to open the email to be affected by the vulnerability if you have a preview window.
As a result, we strongly advise that you take action to patch user systems within your organization immediately.
More information and remediation details can be found at: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397
The following Outlook clients are impacted:
| Release Date | Product | Impact | Max Severity | Article | Download |
| Mar 14, 2023 | Microsoft Outlook 2016 (64-bit edition) | Elevation of Privilege | Critical | 5002254 | Security Update |
| Mar 14, 2023 | Microsoft Outlook 2013 Service Pack 1 (32-bit editions) | Elevation of Privilege | Critical | 5002265 | Security Update |
| Mar 14, 2023 | Microsoft Outlook 2013 RT Service Pack 1 | Elevation of Privilege | Critical | 5002265 | Security Update |
| Mar 14, 2023 | Microsoft Outlook 2013 Service Pack 1 (64-bit editions) | Elevation of Privilege | Critical | 5002265 | Security Update |
| Mar 14, 2023 | Microsoft Office 2019 for 32-bit editions | Elevation of Privilege | Critical | Click to Run | Security Update |
| Mar 14, 2023 | Microsoft 365 Apps for Enterprise for 32-bit Systems | Elevation of Privilege | Critical | Click to Run | Security Update |
| Mar 14, 2023 | Microsoft Office 2019 for 64-bit editions | Elevation of Privilege | Critical | Click to Run | Security Update |
| Mar 14, 2023 | Microsoft 365 Apps for Enterprise for 64-bit Systems | Elevation of Privilege | Critical | Click to Run | Security Update |
| Mar 14, 2023 | Microsoft Office LTSC 2021 for 64-bit editions | Elevation of Privilege | Critical | Click to Run | Security Update |
| Mar 14, 2023 | Microsoft Outlook 2016 (32-bit edition) | Elevation of Privilege | Critical | 5002254 | Security Update |
| Mar 14, 2023 | Microsoft Office LTSC 2021 for 32-bit editions | Elevation of Privilege | Critical | Click to Run | Security Update |
At Tigunia we stand ready to assist you with protecting your computers and users from this threat. Please contact your TAM or call Support at 866-562-8911 or via email at support@tigunia.com for assistance.