Is CVE-2022-21978 in the CISA KEV catalog?

No. CVE-2022-21978 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-21978?

CVE-2022-21978 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2022-21978?

CVE-2022-21978 has an EPSS score of 0.84% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-21978?

Install KB5014260 for Microsoft Exchange Server 2013 Cumulative Update 23. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2022-21978

HIGH

8.2

CVSS v3

NVD

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

How to fix

Remediation Available

Microsoft Exchange Server 2013 Cumulative Update 23Microsoft

Install:KB5014260Microsoft

Microsoft Exchange Server 2016 Cumulative Update 22Microsoft

Install:KB5014261Microsoft

Microsoft Exchange Server 2016 Cumulative Update 23Microsoft

Install:KB5014261Microsoft

Microsoft Exchange Server 2019 Cumulative Update 11Microsoft

Install:KB5014261Microsoft

Microsoft Exchange Server 2019 Cumulative Update 12Microsoft

Install:KB5014261Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.84%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Other references1

msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-01-02.