Is CVE-2022-21855 in the CISA KEV catalog?

No. CVE-2022-21855 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-21855?

CVE-2022-21855 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2022-21855?

CVE-2022-21855 has an EPSS score of 0.93% (56th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-21855?

Install KB5008631 for Microsoft Exchange Server 2013 Cumulative Update 23. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2022-21855

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:KB5008631Microsoft

Microsoft Exchange Server 2016 Cumulative Update 21Microsoft

Install:KB5008631Microsoft

Microsoft Exchange Server 2016 Cumulative Update 22Microsoft

Install:KB5008631Microsoft

Microsoft Exchange Server 2019 Cumulative Update 10Microsoft

Install:KB5008631Microsoft

Microsoft Exchange Server 2019 Cumulative Update 11Microsoft

Install:KB5008631Microsoft

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

0.93%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Other references2

Embed a live status badge for CVE-2022-21855

Markdown

[![CVE-2022-21855](https://tridentstack.com/cve/badge/CVE-2022-21855.svg)](https://tridentstack.com/cve/CVE-2022-21855)

HTML

<a href="https://tridentstack.com/cve/CVE-2022-21855"><img src="https://tridentstack.com/cve/badge/CVE-2022-21855.svg" alt="CVE-2022-21855"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.