# CVE-2023-35311

Microsoft Outlook Security Feature Bypass Vulnerability

- Page: https://www.vulneraibility.com/cve/CVE-2023-35311
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2023-07-11; CISA due date 2023-08-01
- EPSS: 15.52% (percentile 96.9)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-02-04)
- Weakness: CWE-367
- Published: 2023-07-11

## Affected versions

- Microsoft Microsoft 365 Apps for Enterprise: affected >= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office 2019: affected >= 19.0.0 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office LTSC 2021: affected >= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Outlook 2013: affected >= 14.0.0 and < 15.0.5571.1000
- Microsoft Microsoft Outlook 2013 Service Pack 1: affected >= 15.0.0.0 and < 15.0.5571.1000
- Microsoft Microsoft Outlook 2016: affected >= 16.0.0.0 and < 16.0.5404.1000

A version outside these ranges is not a statement that it is unaffected.

## References

- [advisory] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.