Is CVE-2021-33768 in the CISA KEV catalog?

No. CVE-2021-33768 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33768?

CVE-2021-33768 has a CVSS v3 base score of 8.0 (HIGH).

What is the EPSS score for CVE-2021-33768?

CVE-2021-33768 has an EPSS score of 1.16% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33768?

Install KB5004779 for Microsoft Exchange Server 2016 Cumulative Update 20. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-33768

HIGH

8.0

CVSS v3

NVD

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

How to fix

Remediation Available

Microsoft Exchange Server 2016 Cumulative Update 20Microsoft

Install:KB5004779Microsoft

Microsoft Exchange Server 2016 Cumulative Update 21Microsoft

Install:KB5004779Microsoft

Microsoft Exchange Server 2019 Cumulative Update 10Microsoft

Install:KB5004780Microsoft

Microsoft Exchange Server 2019 Cumulative Update 9Microsoft

Install:KB5004780Microsoft

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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.16%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Patch1

portal.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 2024-11-21.