CVE-2018-8581Actively exploitedAdded to KEV 2022-03-03Known ransomware campaign use

Microsoft Exchange Server Privilege Escalation Vulnerability

Microsoft, Exchange Server

Description

A privilege escalation vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could attempt to impersonate any other user of the Exchange server.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

High

27.4%

estimated chance of real-world exploitation in the next 30 days, higher than 98.1% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-03-17

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