CVE-2021-42321
HighActively exploited (CISA KEV)Known to be used in ransomware campaigns
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
SeverityHigh
CVSS8.8
Exploit probability—
Product
Microsoft Exchange
PublishedNov 10, 2021
First seenNov 10, 2021
Added to KEVNov 17, 2021
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Dec 1, 2021Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft exchange_server | 2016, 2019 | — |
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