Medium severity5.4NVD Advisory· Published Feb 25, 2021· Updated Jun 17, 2026
CVE-2021-1730
CVE-2021-1730
Description
A spoofing vulnerability exists in Microsoft Exchange Server which could result in an attack that would allow a malicious actor to impersonate the user. This update addresses this vulnerability. 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.
Affected products
3cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*
- (no CPE)
Patches
Vulnerability mechanics
References
1- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1730nvdPatchVendor Advisory
News mentions
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