Is CVE-2021-28483 in the CISA KEV catalog?

No. CVE-2021-28483 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28483?

CVE-2021-28483 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2021-28483?

CVE-2021-28483 has an EPSS score of 1.20% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28483?

Install KB5001779 for Microsoft Exchange Server 2013 Cumulative Update 23. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28483

CRITICAL

9.0

CVSS v3

NVD

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

How to fix

Remediation Available

Microsoft Exchange Server 2013 Cumulative Update 23Microsoft

Install:KB5001779Microsoft

Microsoft Exchange Server 2016 Cumulative Update 19Microsoft

Install:KB5001779Microsoft

Microsoft Exchange Server 2016 Cumulative Update 20Microsoft

Install:KB5001779Microsoft

Microsoft Exchange Server 2019 Cumulative Update 8Microsoft

Install:KB5001779Microsoft

Microsoft Exchange Server 2019 Cumulative Update 9Microsoft

Install:KB5001779Microsoft

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

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.20%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% 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.