CVE-2021-38646CISA KEV

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

Severity unknownCVSS unknownCheck the vendor advisory for fixed versions

CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.

CISA KEV Check MSRC

CISA catalog record

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

Product: Office
Added to KEV: 28 Mar 2022
Federal remediation due: 18 Apr 2022
Known ransomware use: Yes

Page history

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Field-level log (2)

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23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2021-38646. The catalog has a separate collection scope from Microsoft release records.

More advisories, affected versions and source history

cve-program · CVE-2021-38646

Published

Microsoft 365 Apps for Enterprise

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Microsoft 365 Apps for Enterprise",
                    "platforms": [
                        "32-bit Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "16.0.1",
                            "lessThan": "https://aka.ms/OfficeSecurityReleases",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Microsoft Office 2013 Service Pack 1

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Microsoft Office 2013 Service Pack 1",
                    "platforms": [
                        "32-bit Systems",
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "15.0.0",
                            "lessThan": "5381.1000",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Microsoft Office 2016

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Microsoft Office 2016",
                    "platforms": [
                        "32-bit Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "16.0.0",
                            "lessThan": "5215.1000",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Microsoft Office 2019

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Microsoft Office 2019",
                    "platforms": [
                        "32-bit Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "19.0.0",
                            "lessThan": "https://aka.ms/OfficeSecurityReleases",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON