title: Microsoft Exchange Server Spoofing Vulnerability
description: <p>A spoofing vulnerability exists in Microsoft Exchange Server which could result in an attack that would allow a malicious actor to impersonate the user.</p>
<p>This update addresses this vulnerability.</p>
<p>To prevent these types of attacks, Microsoft recommends customers to download inline images from different DNSdomains than the rest of OWA. Please see further instructions in the FAQ to put in place this mitigations.</p>
problem types: Spoofing
affected:
{
vendor: Microsoft
product: Microsoft Exchange Server 2019 Cumulative Update 7
cpes: cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 15.02.0, lessThan: publication, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Microsoft Exchange Server 2016 Cumulative Update 18
cpes: cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 15.01.0, lessThan: publication, versionType: custom, status: affected
}
metrics:
format: CVSS
scenarios: GENERAL
cvssV3_1: [
version: 3.1
baseSeverity: MEDIUM
baseScore: 5.4
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
]