CVE-2021-33766

Vulnerability details

Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.

Added to CISA KEV: 2022-01-18

Ransomware campaign use: Unknown

CISA due date: 2022-02-01

Defensive guidance from CISA

Apply updates per vendor instructions.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.