CVE-2019-1084

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'.

Published: 2019-07-15 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-1084 is rated Moderate Risk (61/100): CVSS Medium severity, with high exploitation likelihood (EPSS 9.03%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.66% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-1084

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-28 6.37% 9.03% +2.66%
2 2025-12-27 9.03% 6.37% -2.66%
3 2025-12-18 — 9.03% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-1084

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2019-1084

Affected software / configurations for CVE-2019-1084

Vendor Product Version Raw CPE
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp2:*:*:*:*:*:*
microsoft exchange_server 2013 cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
microsoft exchange_server 2016 cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*
microsoft exchange_server 2016 cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*
microsoft exchange_server 2016 cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*
microsoft exchange_server 2016 cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_2:*:*:*:*:*:*
microsoft lync 2013 cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:*
microsoft lync_basic 2013 cpe:2.3:a:microsoft:lync_basic:2013:sp1:*:*:*:*:*:*
microsoft mail_and_calendar — cpe:2.3:a:microsoft:mail_and_calendar:-:*:*:*:*:*:*:*
microsoft office 2010 cpe:2.3:a:microsoft:office:2010:sp2:*:*:*:*:*:*
microsoft office 2013 cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:*:*
microsoft office 2016 cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:*:*
microsoft office 2016 cpe:2.3:a:microsoft:office:2016:*:*:*:*:mac_os:*:*
microsoft office 2019 cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
microsoft office 2019 cpe:2.3:a:microsoft:office:2019:*:*:*:*:macos:*:*
microsoft office_365_proplus — cpe:2.3:a:microsoft:office_365_proplus:-:*:*:*:*:*:*:*
microsoft outlook — cpe:2.3:a:microsoft:outlook:-:*:*:*:*:iphone_os:*:*
microsoft outlook 2013 cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:*:*:*:*
microsoft outlook 2016 cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*
microsoft outlook 2016 cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:android:*:*
microsoft skype_for_business 2016 cpe:2.3:a:microsoft:skype_for_business:2016:*:*:*:*:*:*:*
microsoft skype_for_business_basic 2016 cpe:2.3:a:microsoft:skype_for_business_basic:2016:*:*:*:*:*:*:*

References for CVE-2019-1084

cvelogic Threat Intelligence