CVE-2021-38646 (GCVE-0-2021-38646)
Vulnerability from cvelistv5 – Published: 2021-09-15 11:24 – Updated: 2026-08-10 15:11Title
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 · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 18:11 UTC
CWE
- Remote Code Execution
- CWE-noinfo Not enough information
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISCx_transferred |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
guessed | |
| Microsoft | Microsoft Office 2013 Service Pack 1 |
Affected:
15.0.0 , < 5381.1000
(custom)
|
guessed | |
| Microsoft | Microsoft Office 2016 |
Affected:
16.0.0 , < 5215.1000
(custom)
|
guessed | |
| Microsoft | Microsoft Office 2019 |
Affected:
19.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
guessed |
Date Public
2021-09-14 14:00
CISA
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
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cbd3ed60-0306-44ee-85f2-a97eeb03e0ec
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: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 UTC
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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