CVE-2020-0688: Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 100% chance of exploitation in the next 30 days.

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.

Affected products

• Microsoft Exchange Server: version 2010 only; version 2013 only; version 2016 only; version 2019 only

Published 2020-02-11. Last modified 2026-06-17.