CVE-2022-21978

Name: CVE-2022-21978
Creator: NVD / NIST
Published: 2022-05-10T21:15:09.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2022-21978 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. Microsoft Exchange Server Elevation of Privilege Vulnerability. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

Metrics

CVSS 3.1

8.2/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.84%

53.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Microsoft	Exchange Server	2013	Cumulative Update 23
Microsoft	Exchange Server	2016	Cumulative Update 22
Microsoft	Exchange Server	2019	Cumulative Update 11

References

Timeline

Published: May 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21978?

Microsoft Exchange Server Elevation of Privilege Vulnerability

How severe is CVE-2022-21978?

CVE-2022-21978 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21978?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21978?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST