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

Vulnerability from cvelistv5 – Published: 2023-07-11 17:03 – Updated: 2025-10-21 23:05
VLAI CISA KEV
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 KEV
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
Show details on NVD website
To clipboard 

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      "cveMetadata": "{\"cveId\": \"CVE-2023-35311\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:05:43.274Z\", \"dateReserved\": \"2023-06-14T23:09:47.613Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2023-07-11T17:03:27.227Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.