Live › vulnerability › CVE-2021-38646
Go to dashboardMicrosoft Office's Access Connectivity Engine has a remote code execution flaw that is actively exploited, and CISA lists it in its Known Exploited Vulnerabilities catalog with ransomware use noted. An attacker who gets a crafted file to a victim can run code on that machine.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Office | vendor | – | – |
Check the installed Office build against Microsoft's August 2021 security update for CVE-2021-38646 (unknown exact build numbers in sources).
Apply the Microsoft August 2021 Office security updates per vendor instructions (sources give no exact build).
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft Office Access Connectivity Engine contains an unspecified vulnerability which can allow for remote code execution.
CISA required action: Apply updates per vendor instructions.
This page as .md · .json · in your agent: get_signal("CVE-2021-38646")
CISA KEV catalog, Creative Commons 0 · EPSS scores by FIRST, used with attribution · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.