What’s Vulnerable › Vulnerabilities

CVE-2019-1084

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-15 · updated 2026-06-17
• Weakness: CWE-200

Description

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., aka 'Microsoft Exchange Information Disclosure Vulnerability'.

Affected products

• Microsoft Exchange Server: 2010-sp2, 2013-cumulative_update_23, 2016-cumulative_update_1, 2016-cumulative_update_12, 2016-cumulative_update_13, 2016-cumulative_update_2
• Microsoft Lync Server: 2013-sp1
• Microsoft Lync Basic: 2013-sp1
• Microsoft Mail and Calendar: all versions
• Microsoft Office: 2010-sp2, 2013-sp1; 2016, 2019 (and their updates)
• Microsoft Office 365 ProPlus: all versions
• Microsoft Outlook: 2013-sp1; 2016 (and their updates)
• Microsoft Skype for Business Server 2019 CU2: 2016 (and their updates)
• Microsoft Skype for Business Basic: 2016 (and their updates)
• Microsoft Exchange Server: 2010 Service Pack 3
• Microsoft Lync Server: 2013 Service Pack 1 (32-bit), 2013 Service Pack 1 (64-bit)
• Microsoft Lync Basic: 2013 Service Pack 1 (32-bit), 2013 Service Pack 1 (64-bit)
• Microsoft Mail and Calendar: all versions
• Microsoft Exchange Server 2013: Cumulative Update 23
• Microsoft Exchange Server 2016: Cumulative Update 12, Cumulative Update 13
• Microsoft Exchange Server 2019: Cumulative Update 1, Cumulative Update 2
• Microsoft Office: 2013 Service Pack 1 (32-bit editions), 2013 Service Pack 1 (64-bit editions), 2013 RT Service Pack 1, 2016 for Mac, 2016 (32-bit edition), 2016 (64-bit edition) (+3)
• Microsoft Office 365 ProPlus: 32-bit Systems, 64-bit Systems
• Microsoft Outlook: 2010 Service Pack 2 (32-bit editions), 2010 Service Pack 2 (64-bit editions), 2016 (32-bit edition), 2016 (64-bit edition), 2013 Service Pack 1 (32-bit editions), 2013 Service Pack 1 (64-bit editions)
• Microsoft Skype for Business Server 2019 CU2: 2016 (32-bit), 2016 (64-bit)
• Microsoft Skype for Business Basic: 2016 (32-bit), 2016 (64-bit)

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1084
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1084

Get alerted when CVE-2019-1084 or the next vulnerability affects your stack