CVE-2021-26858
HighActively exploited (CISA KEV)Known to be used in ransomware campaigns
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft Exchange Server
PublishedMar 3, 2021
First seenMar 3, 2021
Added to KEVNov 3, 2021
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: May 3, 2022Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft exchange_server | 2013, 2016, 2019 | — |
Check your version
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