CVE-2021-34473
CriticalActively exploited (CISA KEV)Known to be used in ransomware campaigns
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
SeverityCritical
CVSS9.1
Exploit probability—
Product
Microsoft Exchange Server
PublishedJul 14, 2021
First seenJul 14, 2021
Added to KEVNov 3, 2021
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Nov 17, 2021Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft exchange_server | 2013, 2016, 2019 | — |
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