Is CVE-2021-31206 in the CISA KEV catalog?

No. CVE-2021-31206 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31206?

CVE-2021-31206 has a CVSS v3 base score of 7.6 (HIGH).

What is the EPSS score for CVE-2021-31206?

CVE-2021-31206 has an EPSS score of 9.58% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31206?

Install KB5004778 for Microsoft Exchange Server 2013 Cumulative Update 23. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-31206

HIGHEPSS 95th pctl

7.6

CVSS v3

NVD

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

How to fix

Remediation Available

Microsoft Exchange Server 2013 Cumulative Update 23Microsoft

Install:KB5004778Microsoft

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

9.58%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory1

zerodayinitiative.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.