PULSEUnderground Intel

LIVE20signals / 24h

FEED

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CVE Watch—

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: —

EPSS · 30d

100.0%EPSS · 30 days100.0%

2026-09-162026-10-14

KEV catalog record

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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