CVE-2021-42321

Vulnerability details

An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.

Added to CISA KEV: 2021-11-17

Ransomware campaign use: Known

CISA due date: 2021-12-01

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.