VulnerabilityAnalyzed
CVE-2021-38646
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
KEVHIGH 7.8EPSS 7.99%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 18 April 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 7.99% probability · 94th percentile
- CISA KEV
- Listed 28 March 2022 · due 18 April 2022 · used in ransomware campaigns
- Affected
- microsoft/365 apps · microsoft/office · microsoft/office 2016 · microsoft/office 2019
- Source
- secure@microsoft.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-38646
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38646Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38646Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-38646US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.