CVE-2023-35311: Microsoft Outlook Security Feature Bypass Vulnerability

CVE-2023-35311 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2023-07-11

Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt. The flaw is related to a Time-of-check Time-of-use (TOCTOU) race condition (CWE-367).

Technologies: Microsoft Outlook. Vendors: Microsoft.

Quick answers

Is CVE-2023-35311 exploited in the wild?
Yes. CVE-2023-35311 is known to be exploited in the wild, first recorded on 11 July 2023. Treat it as urgent.
How severe is CVE-2023-35311?
Critical severity, with a CVSS score of 8.8, published 11 July 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-2023-35311?
A patch was published on 2023-07-11. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2023-35311 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2023-35311?
Check whether you run Microsoft Outlook. 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

  • 2023-07-11: disclosed
  • 2023-07-11: patched
  • 2023-07-11: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2023-07-11: exploited: Reported as exploited in the wild at time of publication.

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