Microsoft Exchange Server Elevation of Privilege Vulnerability

published 2022-05-10 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-27133

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

Patch / fix

fixed in 5 links 1

Microsoft Microsoft Exchange Server 2016 Cumulative Update 22 15.01.2375.028
Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 15.02.0986.026
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.36
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.009
Microsoft Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.009

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21978 advisory

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.2	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA	3.1	8.2	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

Microsoft Microsoft Exchange Server 2016 Cumulative Update 22
Microsoft Microsoft Exchange Server 2019 Cumulative Update 11
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft Microsoft Exchange Server 2019 Cumulative Update 12

Classification

Technology feeds

Microsoft Exchange rss critical rss

References

portal.msrc.microsoft.com /en-US/security-guidance/advisory/CVE-2022-21978
patch, vendor-advisory
msrc.microsoft.com /update-guide/vulnerability/CVE-2022-21978
vendor-advisory

Sources

CVE List CVE-2022-21978
NVD CVE-2022-21978

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary