CVE-2023-23397: Microsoft Office Outlook Privilege Escalation Vulnerability

CVE-2023-23397 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2023-03-14

Microsoft Outlook contains an elevation of privilege vulnerability that allows for NTLM relay attacks. An attacker can trigger the vulnerability by sending a specially crafted email that causes the client to automatically connect to an attacker-controlled SMB share, leaking NTLM credentials without user interaction.

Technologies: Microsoft Office. Vendors: Microsoft.

Quick answers

Is CVE-2023-23397 exploited in the wild?
Yes. CVE-2023-23397 is known to be exploited in the wild, first recorded on 14 March 2023. Treat it as urgent.
How severe is CVE-2023-23397?
Critical severity, with a CVSS score of 9.8, published 14 March 2023.
Which products and versions are affected?
Microsoft Outlook 2013 Service Pack 1; Microsoft Outlook 2016; Microsoft Office 2019; Microsoft Office LTSC 2021; and 1 more.
Is there a fix for CVE-2023-23397?
A patch was published on 2023-03-14. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2023-23397 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2023-23397?
Check whether you run Microsoft Office. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Outlook 2013 Service Pack 1
  • Microsoft Outlook 2016
  • Microsoft Office 2019
  • Microsoft Office LTSC 2021
  • Microsoft Microsoft 365 Apps for Enterprise

Timeline

  • 2023-03-14: disclosed
  • 2023-03-14: patched
  • 2023-03-14: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2023-03-14: exploited: Reported as exploited in the wild at time of publication.

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