Vulnerability Intelligence Report
Microsoft Outlook Security Feature Bypass Vulnerability
CVE-2023-35311
Microsoft Outlook Security Feature Bypass Vulnerability
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
7.5
HIGH
Exploitability:1.7
Impact Score:5.9
EPSS Probability:15.03%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-367 ↗CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 < https://aka.ms/OfficeSecurityReleases (affected) |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 < https://aka.ms/OfficeSecurityReleases (affected) |
| Microsoft | Microsoft Office 2019 | 19.0.0 < https://aka.ms/OfficeSecurityReleases (affected) |
| Microsoft | Microsoft Outlook 2016 | 16.0.0.0 < 16.0.5404.1000 (affected) |
| Microsoft | Microsoft Outlook 2013 | 14.0.0 < 15.0.5571.1000 (affected) |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 | 15.0.0.0 < 15.0.5571.1000 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2023-06-14T23:09:47 |
| Published | 2023-07-11T17:03:27 |
| Patch Date | 2023-07-11 |
| Last Updated | 2025-10-21T23:05:43 |
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