CVE-2021-1730
Plain English Summary
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This vulnerability allows an attacker to impersonate a user in Microsoft Exchange Server, potentially tricking others into believing they are communicating with that user. To exploit this, the attacker may need to manipulate how images are loaded in emails, so it's important for users to follow Microsoft's recommendations for securing their settings.
Technical 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>
CVSS Vector Analysis
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:NExploit Resources
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Official References
Quick Information
Published
Feb 25, 2021
about 5 years ago
Last Modified
Feb 24, 2026
about 1 month ago
Vendor
microsoft
Product
exchange server
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