CVE-2021-38646 (GCVE-0-2021-38646)
Vulnerability from cvelistv5 – Published: 2021-09-15 11:24 – Updated: 2025-10-21 23:25Title
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
Summary
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- Remote Code Execution
- CWE-noinfo Not enough information
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft Office 2019 |
Affected:
19.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:* |
|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:* |
|
| Microsoft | Microsoft Office 2016 |
Affected:
16.0.0 , < 5215.1000
(custom)
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:* cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:* |
|
| Microsoft | Microsoft Office 2013 Service Pack 1 |
Affected:
15.0.0 , < 5381.1000
(custom)
cpe:2.3:a:microsoft:office:2013:sp1:*:*:rt:*:*:* cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:x86:* cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:x64:* |
Date Public
2021-09-14 07:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 336c2a6b-7714-497e-ab1f-9b677e40341e
Exploited: Yes
Timestamps
First Seen: 2022-03-28
Asserted: 2022-03-28
Scope
Notes: KEV entry: Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability | Affected: Microsoft / Office | Description: Microsoft Office Access Connectivity Engine contains an unspecified vulnerability which can allow for remote code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-04-18 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-38646
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Office |
| Due Date | 2022-04-18 |
| Date Added | 2022-03-28 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 12:27 UTC
| Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 62a96021-79fd-4fd1-87f1-5f796f5eb18b
Exploited: Yes
Timestamps
First Seen: 2022-03-28
Asserted: 2022-03-28
Scope
Notes: KEVIntel entry: Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability | Affected: Microsoft / Microsoft Office 2019, Microsoft 365 Apps for Enterprise, Microsoft Office 2016, Microsoft Office 2013 Service Pack 1 | CVSS: 7.8 (HIGH) | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability |
| Vendor | Microsoft |
| Product | Microsoft Office 2019, Microsoft 365 Apps for Enterprise, Microsoft Office 2016, Microsoft Office 2013 Service Pack 1 |
| Added Date | 2022-03-28T00:00:00.000Z |
| Cvss Score | 7.8 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | yes |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-19 12:47 UTC
| Updated: 2026-06-19 12:47 UTC
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"cveMetadata": "{\"cveId\": \"CVE-2021-38646\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:25:33.296Z\", \"dateReserved\": \"2021-08-13T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-09-15T11:24:06.000Z\", \"assignerShortName\": \"microsoft\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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