Is CVE-2023-21764 in the CISA KEV catalog?

No. CVE-2023-21764 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-21764?

CVE-2023-21764 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2023-21764?

CVE-2023-21764 has an EPSS score of 0.57% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-21764?

Install KB5022143 for Microsoft Exchange Server 2016 Cumulative Update 23. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2023-21764

HIGH

7.8

CVSS v3

NVD

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

CWE-426

How to fix

Remediation Available

Microsoft Exchange Server 2016 Cumulative Update 23Microsoft

Install:KB5022143Microsoft

Microsoft Exchange Server 2019 Cumulative Update 11Microsoft

Install:KB5022193Microsoft

Microsoft Exchange Server 2019 Cumulative Update 12Microsoft

Install:KB5022193Microsoft

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.57%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Other references1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-426 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-0096	High	9.3	71%	-	-
CVE-2016-10009	High	7.3	37%	-	Fix
CVE-2016-0016	High	7.8	31%	-	-
CVE-2012-1854	High	7.8	21%	KEV	-
CVE-2018-12589	High	7.8	20%	-	-
CVE-2022-22047	High	7.8	19%	KEV	Fix

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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 2024-11-21.