Microsoft Outlook Security Feature Bypass Vulnerability
Summary
| CVE | CVE-2023-35311 |
|---|---|
| State | PUBLISHED |
| Assigner | microsoft |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-07-11 18:15:17 UTC |
| Updated | 2026-10-08 10:35:03 UTC |
| Description | Microsoft Outlook Security Feature Bypass Vulnerability |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS: 0.155220000 probability, percentile 0.968050000 (date 2026-10-22)
CISA KEV: Listed on 2023-07-11; due 2023-08-01; ransomware use Unknown
Problem Types: CWE-367 | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Primary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA Known Exploited Vulnerability
| Vendor | Microsoft |
|---|---|
| Product | Outlook |
| Name | Microsoft Outlook Security Feature Bypass Vulnerability |
| Required Action | Apply updates per vendor instructions or discontinue use of the product if updates are unavailable. |
| Notes | https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311; https://nvd.nist.gov/vuln/detail/CVE-2023-35311 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Microsoft | 365 Apps | - | All | All | All |
| Application | Microsoft | Office 2019 | - | All | All | All |
| Application | Microsoft | Office 2019 | - | All | All | All |
| Application | Microsoft | Office 2021 | - | All | All | All |
| Application | Microsoft | Office 2021 | - | All | All | All |
| Application | Microsoft | Outlook | 2013 | - | - | All |
| Application | Microsoft | Outlook | 2013 | sp1 | All | All |
| Application | Microsoft | Outlook | 2016 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Microsoft | Microsoft 365 Apps For Enterprise | affected 16.0.1 https://aka.ms/OfficeSecurityReleases custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Microsoft Office LTSC 2021 | affected 16.0.1 https://aka.ms/OfficeSecurityReleases custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Microsoft Office 2019 | affected 19.0.0 https://aka.ms/OfficeSecurityReleases custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Microsoft Outlook 2016 | affected 16.0.0.0 16.0.5404.1000 custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Microsoft Outlook 2013 | affected 14.0.0 15.0.5571.1000 custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Microsoft Outlook 2013 Service Pack 1 | affected 15.0.0.0 15.0.5571.1000 custom | ARM64-based Systems |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Security Update Guide - Microsoft Security Response Center | af854a3a-2127-422b-91ae-364da2661108 | msrc.microsoft.com | Patch, Vendor Advisory |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.