CVE-2023-35311 (GCVE-0-2023-35311)

Vulnerability from cvelistv5 – Published: 2023-07-11 17:03 – Updated: 2025-10-21 23:05
VLAI CISA KEVIntel
Title
Microsoft Outlook Security Feature Bypass Vulnerability
Summary
Microsoft Outlook Security Feature Bypass Vulnerability
Severity
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
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version
Microsoft Microsoft 365 Apps for Enterprise Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Create a notification for this product.
Microsoft Microsoft Office LTSC 2021 Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Create a notification for this product.
Microsoft Microsoft Office 2019 Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Create a notification for this product.
Microsoft Microsoft Outlook 2016 Affected: 16.0.0.0 , < 16.0.5404.1000 (custom)
Create a notification for this product.
Microsoft Microsoft Outlook 2013 Affected: 14.0.0 , < 15.0.5571.1000 (custom)
Create a notification for this product.
Microsoft Microsoft Outlook 2013 Service Pack 1 Affected: 15.0.0.0 , < 15.0.5571.1000 (custom)
Create a notification for this product.
Date Public
2023-07-11 07:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f56611e9-2960-4084-a7c1-249e89de3dbd

Vulnerability ID: CVE-2023-35311

Status: Confirmed

Status Updated: 2023-07-11 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-07-11
Asserted: 2023-07-11
Scope
Notes: KEV entry: Microsoft Outlook Security Feature Bypass Vulnerability | Affected: Microsoft / Outlook | Description: Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt. | Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable. | Due date: 2023-08-01 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311; https://nvd.nist.gov/vuln/detail/CVE-2023-35311
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-367
Feed CISA Known Exploited Vulnerabilities Catalog
Product Outlook
Due Date 2023-08-01
Date Added 2023-07-11
Vendorproject Microsoft
Vulnerabilityname Microsoft Outlook Security Feature Bypass Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 330812e3-4bed-46d7-9490-a7128051521d

Vulnerability ID: CVE-2023-35311

Status: Confirmed

Status Updated: 2023-07-11 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-07-11
Asserted: 2023-07-11
Scope
Notes: KEVIntel entry: Microsoft Outlook Security Feature Bypass Vulnerability | Affected: Microsoft / Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office 2019, Microsoft Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2013 Service Pack 1 | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Microsoft Outlook Security Feature Bypass Vulnerability
Vendor Microsoft
Product Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office 2019, Microsoft Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2013 Service Pack 1
Added Date 2023-07-11T00:00:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-06-23 14:05 UTC
Show details on NVD website
To clipboard 

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  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.