All vulnerabilities
CVE-2023-35311

Microsoft Outlook Security Feature Bypass Vulnerability

Microsoft OutlookApplications & CMS
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationExploited in the wildAdded to KEV 11 Jul 2023CISA KEV
Exploit odds (EPSS)15.5%Chance of exploitation activity in the next 30 days, higher than 96% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in16.0.5404.1000Also 15.0.5571.1000CVE List
Federal deadline1 Aug 2023Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions or discontinue use of the product if updates are unavailable. CISA KEV

What fixes it

  • 16.0.5404.1000Microsoft Outlook 2016CVE List
  • 15.0.5571.1000Microsoft Outlook 2013CVE List
  • 15.0.5571.1000Microsoft Outlook 2013 Service Pack 1CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 11 Jul 2023Added to CISA KEVCISA KEV
  2. 11 Jul 2023, 17:03 UTCPublishedCVE List

Description

Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.

Text from CVE List

Affected versions 6

  • Microsoft 365 Apps for Enterpriseaffected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office LTSC 2021affected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office 2019affected: 19.0.0 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Outlook 2016affected: 16.0.0.0 before 16.0.5404.1000CVE List
  • Microsoft Outlook 2013affected: 14.0.0 before 15.0.5571.1000CVE List
  • Microsoft Outlook 2013 Service Pack 1affected: 15.0.0.0 before 15.0.5571.1000CVE List

References 4