Is CVE-2023-21761 in the CISA KEV catalog?

No. CVE-2023-21761 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-21761?

CVE-2023-21761 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-21761?

CVE-2023-21761 has an EPSS score of 1.59% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-21761?

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

CVE & CISA-KEV Catalog

CVE-2023-21761

HIGHEPSS 73th pctl

7.5

CVSS v3

NVD

Description

Microsoft Exchange Server Information Disclosure Vulnerability

CWE-918Server-Side Request Forgery (SSRF)

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.59%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Other references1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-21893	High	8.2	100%	KEV + Ransom	-
CVE-2021-40438	Critical	9.0	100%	KEV	Fix
CVE-2021-34473	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-26855	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-41040	High	8.8	100%	KEV + Ransom	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.