CVE-2020-0688
Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability
CVSS
—
No CVSS
EPSS
100.0%
p100
KEV
YES
Nov 3, 2021
Exploit Today
80
0-100
Published: — · Last modified: —
100.0%EPSS · 30 days100.0%
2026-08-022026-08-30
Product
Microsoft / Exchange Server
Vulnerability
Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability
Added to KEV
Nov 3, 2021
Remediate by
May 3, 2022
Known ransomware use
Yes
Summary description
Microsoft Exchange Server Validation Key fails to properly create unique keys at install time, allowing for remote code execution.
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2020-0688
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