What’s Vulnerable › Vulnerabilities

CVE-2020-17119: Microsoft Outlook Information Disclosure Vulnerability

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-09 · updated 2026-06-17

Description

Microsoft Outlook Information Disclosure Vulnerability

Affected products

• Microsoft 365 Apps: all versions
• Microsoft Office: 2019
• Microsoft Outlook: 2010-sp2, 2013-sp1, 2016
• Microsoft 365 Apps: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
• Microsoft Office 2019 for Mac: from 16.0.0 before publication — fixed in publication
• Microsoft Outlook 2010 Service Pack 2: from 13.0.0.0 before publication — fixed in publication
• Microsoft Outlook 2013 Service Pack 1: from 15.0.0.0 before publication — fixed in publication
• Microsoft Office: from 19.0.0 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
• Microsoft Outlook 2016 for Mac: from 16.0.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft 365 Apps https://aka.ms/OfficeSecurityReleases; Microsoft Office 2019 for Mac publication; Microsoft Outlook 2010 Service Pack 2 publication; Microsoft Outlook 2013 Service Pack 1 publication; Microsoft Office https://aka.ms/OfficeSecurityReleases; Microsoft Outlook 2016 for Mac publication. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17119
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17119

Get alerted when CVE-2020-17119 or the next vulnerability affects your stack