CVE-2021-33766
Microsoft Exchange Server Information Disclosure
CVSS
—
No CVSS
EPSS
97.5%
p100
KEV
YES
Jan 18, 2022
Exploit Today
80
0-100
Published: — · Last modified: —
97.5%EPSS · 30 days97.5%
2026-06-302026-07-16
Product
Microsoft / Exchange Server
Vulnerability
Microsoft Exchange Server Information Disclosure
Added to KEV
Jan 18, 2022
Remediate by
Feb 1, 2022
Known ransomware use
No
Summary description
Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-33766
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