Microsoft Office
CVE-2019-1084 — Microsoft Exchange Information Disclosure Vulnerability
Executive Summary
An information disclosure vulnerability exists when Exchange allows creation of entities with Display Names having non-printable characters. An authenticated attacker could exploit this vulnerability by creating entities with invalid display names, which, when added to conversations, remain invisible. This security update addresses the issue by validating display names upon creation in Microsoft Exchange, and by rendering invalid display names correctly in Microsoft Outlook clients.
Overview
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
EPSS Score
0.05328
probability of exploitation in the next 30 days
0.91561 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
34 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Mail and Calendar | Release Notes (Security Update) Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2010 Service Pack 3 | 4509410 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2013 Cumulative Update 23 | 4509409 (Security Update) 4509409 (Security Update) 4509409 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2016 Cumulative Update 12 | 4509409 (Security Update) 4509409 (Security Update) 4509409 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2016 Cumulative Update 13 | 4509409 (Security Update) 4509409 (Security Update) 4509409 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2019 Cumulative Update 1 | 4509408 (Security Update) 4509408 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2019 Cumulative Update 2 | 4509408 (Security Update) 4509408 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Lync 2013 Service Pack 1 (32-bit) | 4475519 (Security Update) 4475519 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Lync 2013 Service Pack 1 (64-bit) | 4475519 (Security Update) 4475519 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Lync Basic 2013 Service Pack 1 (32-bit) | 4475519 (Security Update) 4475519 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Lync Basic 2013 Service Pack 1 (64-bit) | 4475519 (Security Update) 4475519 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2013 RT Service Pack 1 | 4464558 (Security Update) 4464558 (Security Update) 4464558 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2013 Service Pack 1 (32-bit editions) | 4464558 (Security Update) 4464558 (Security Update) 4464558 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2013 Service Pack 1 (64-bit editions) | 4464558 (Security Update) 4464558 (Security Update) 4464558 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2016 (32-bit edition) | 4475514 (Security Update) 4475514 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2016 (64-bit edition) | 4475514 (Security Update) 4475514 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2016 for Mac | — |
Important | Information Disclosure | Unknown |
| Microsoft Office 2019 for 32-bit editions | Click to Run (Security Update) Click to Run (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office 2019 for 64-bit editions | Click to Run (Security Update) Click to Run (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office 2019 for Mac | — |
Important | Information Disclosure | Unknown |
| Microsoft Outlook 2010 Service Pack 2 (32-bit editions) | 4475509 (Security Update) 4475509 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Outlook 2010 Service Pack 2 (64-bit editions) | 4475509 (Security Update) 4475509 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Outlook 2013 Service Pack 1 (32-bit editions) | 4464592 (Security Update) 4464592 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Outlook 2013 Service Pack 1 (64-bit editions) | 4464592 (Security Update) 4464592 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Outlook 2016 (32-bit edition) | 4475517 (Security Update) 4475517 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Outlook 2016 (64-bit edition) | 4475517 (Security Update) 4475517 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Outlook for Android | Release Notes (Security Update) Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Office 365 ProPlus for 32-bit Systems | Click to Run (Security Update) Click to Run (Security Update) |
Important | Information Disclosure | No |
| Office 365 ProPlus for 64-bit Systems | Click to Run (Security Update) Click to Run (Security Update) |
Important | Information Disclosure | No |
| Outlook for iOS | — |
Important | Information Disclosure | Unknown |
| Skype for Business 2016 (32-bit) | 4475545 (Security Update) 4475545 (Security Update) |
Important | Information Disclosure | Maybe |
| Skype for Business 2016 (64-bit) | 4475545 (Security Update) 4475545 (Security Update) |
Important | Information Disclosure | Maybe |
| Skype for Business 2016 Basic (32-bit) | 4475545 (Security Update) 4475545 (Security Update) |
Important | Information Disclosure | Maybe |
| Skype for Business 2016 Basic (64-bit) | 4475545 (Security Update) 4475545 (Security Update) |
Important | Information Disclosure | Maybe |
Patches
13 patches
| Article | Type | Restart |
|---|---|---|
Release Notes (Security Update) Release Notes |
Security Update | Maybe |
4509410 |
Security Update | Maybe |
4509409 (Security Update) 4509409 (Security Update) 4509409 |
Security Update | Maybe |
4509408 (Security Update) 4509408 |
Security Update | Maybe |
4475519 (Security Update) 4475519 |
Security Update | Maybe |
4464558 (Security Update) 4464558 (Security Update) 4464558 |
Security Update | Maybe |
4475514 (Security Update) 4475514 |
Security Update | Maybe |
— |
Unknown | |
Click to Run (Security Update) Click to Run |
Security Update | No |
4475509 (Security Update) 4475509 |
Security Update | Maybe |
4464592 (Security Update) 4464592 |
Security Update | Maybe |
4475517 (Security Update) 4475517 |
Security Update | Maybe |
4475545 (Security Update) 4475545 |
Security Update | Maybe |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Jonathan Birch of Microsoft Corporation
References
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