Is CVE-2021-38646 in the CISA KEV catalog?

Yes. CVE-2021-38646 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-28, and has known ransomware campaign use.

What is the CVSS severity of CVE-2021-38646?

CVE-2021-38646 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-38646?

CVE-2021-38646 has an EPSS score of 4.04% (89th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-38646

HIGHCISA KEVEPSS 89th pctl

7.8

CVSS v3

NVD

Description

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.04%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

Microsoft Office Access Connectivity Engine contains an unspecified vulnerability which can allow for remote code execution.

Apply updates per vendor instructions.

Remediation due: 2022-04-18

Associated with ransomware campaigns

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 2025-10-30.