CVE-2023-23397: Microsoft Outlook Elevation of Privilege Vulnerability
First published: Tue Mar 14 2023(Updated: )
Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user.
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Outlook 2013 RT | ||
| Microsoft Outlook 2013 | ||
| Microsoft Outlook 2016 | ||
| Microsoft Outlook 2016 | ||
| Microsoft Outlook 2013 | ||
| Microsoft Office 2019 for Mac | ||
| Microsoft Office LTSC 2021 | ||
| Microsoft Office 2019 for Mac | ||
| Microsoft Office LTSC 2021 | ||
| Microsoft Office | ||
| Microsoft 365 Apps for Enterprise | ||
| Microsoft 365 Apps for Enterprise | ||
| Microsoft 365 Apps for enterprise | ||
| Microsoft Office | =2019 | |
| Microsoft Office Long Term Servicing Channel | =2021 | |
| Microsoft Outlook | =2013-sp1 | |
| Microsoft Outlook | =2013-sp1 | |
| Microsoft Outlook | =2016 | |
| Microsoft Office | =2021 | |
| Microsoft Outlook | =2013-sp1 | |
| =2019 | ||
| =2021 | ||
| =2013-sp1 | ||
| =2013-sp1 | ||
| =2016 |
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Reference Links
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397 (Advisory)
- https://www.bleepingcomputer.com/news/security/nato-and-eu-condemn-russias-cyberattacks-against-germany-czechia/
- https://www.bleepingcomputer.com/news/security/poland-says-russian-military-hackers-target-its-govt-networks/
- https://www.darkreading.com/threat-intelligence/microsoft-russian-sandworm-apt-exploits-edge-bugs-globally
- https://www.theregister.com/2025/02/25/new_ics_malware_dragos/
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-23397,
- https://msrc.microsoft.com/blog/2023/03/microsoft-mitigates-outlook-elevation-of-privilege-vulnerability/,
- https://nvd.nist.gov/vuln/detail/CVE-2023-23397
- https://www.theregister.com/2025/03/10/infosec_in_brief/
Frequently Asked Questions
What is CVE-2023-23397?
CVE-2023-23397 is a privilege escalation vulnerability in Microsoft Office Outlook.
What is the severity of CVE-2023-23397?
CVE-2023-23397 has a severity level of critical.
How does CVE-2023-23397 affect Microsoft Office Outlook?
CVE-2023-23397 allows for an NTLM Relay attack against another service to authenticate as the user.
Which versions of Microsoft Office are affected by CVE-2023-23397?
Microsoft Office versions including Office 2019, Office 365 Apps for Enterprise, and Office LTSC 2021 are affected by CVE-2023-23397.
How can I mitigate CVE-2023-23397 in Microsoft Office Outlook?
To mitigate CVE-2023-23397, apply the security updates provided by Microsoft for the affected versions of Microsoft Office Outlook.
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