Is CVE-2020-17144 in the CISA KEV catalog?

Yes. CVE-2020-17144 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03.

What is the CVSS severity of CVE-2020-17144?

CVE-2020-17144 has a CVSS v3 base score of 8.4 (HIGH).

What is the EPSS score for CVE-2020-17144?

CVE-2020-17144 has an EPSS score of 36.51% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2020-17144

HIGHCISA KEVEPSS 98th pctl

8.4

CVSS v3

NVD

Description

Microsoft Exchange Remote Code Execution Vulnerability

CWE-502Deserialization of Untrusted Data

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

36.51%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.

Apply updates per vendor instructions.

Remediation due: 2022-05-03

References

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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 2025-10-29.