CVE-2021-1730

medium Microsoft
CVSS v3 Base Score
5.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS Score
2.0%
Exploitation probability in 30 days
Top 16% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Published: February 25, 2021 (1904 days ago)
Last Modified: February 24, 2026
Vendor: Microsoft

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>

CWE

NVD-CWE-noinfo

Affected Products

microsoft exchange server

References

🔗 portal.msrc.microsoft.com 🔗 portal.msrc.microsoft.com