CVE-2021-1647 (GCVE-0-2021-1647)
Vulnerability from cvelistv5 – Published: 2021-01-12 19:42 – Updated: 2025-10-21 23:35Title
Microsoft Defender Remote Code Execution Vulnerability
Summary
Microsoft Defender Remote Code Execution Vulnerability
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-01-24 15:56 UTC
CWE
- Remote Code Execution
- CWE-noinfo Not enough information
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisory |
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISCx_transferred |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Microsoft System Center Endpoint Protection |
Affected:
N/A
cpe:2.3:a:microsoft:system_center_endpoint_protection:-:*:*:*:*:*:*:* |
||
| Microsoft | Microsoft System Center 2012 R2 Endpoint Protection |
Affected:
N/A
cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:r2:*:*:*:*:*:* |
||
| Microsoft | Microsoft Security Essentials |
Affected:
N/A
cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:* |
||
| Microsoft | Microsoft System Center 2012 Endpoint Protection |
Affected:
N/A
cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:-:*:*:*:*:*:* |
||
| Microsoft | Windows Defender |
Affected:
N/A
cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:* |
Date Public
2021-01-12 08:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 83cdbe91-6e99-4b5c-8711-ec29716df524
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Microsoft Defender Remote Code Execution Vulnerability | Affected: Microsoft / Defender | Description: Microsoft Defender contains an unspecified vulnerability that allows for remote code execution. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-1647
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-122 CWE-1285 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Defender |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Defender Remote Code Execution Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 13:26 UTC
| Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 57db2ca2-7d39-455b-a493-ddd06b200884
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: Microsoft Defender Remote Code Execution Vulnerability | Affected: Microsoft / Microsoft System Center Endpoint Protection, Microsoft System Center 2012 R2 Endpoint Protection, Microsoft Security Essentials, Microsoft System Center 2012 Endpoint Protection, Windows Defender | CVSS: 7.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Microsoft Defender Remote Code Execution Vulnerability |
| Vendor | Microsoft |
| Product | Microsoft System Center Endpoint Protection, Microsoft System Center 2012 R2 Endpoint Protection, Microsoft Security Essentials, Microsoft System Center 2012 Endpoint Protection, Windows Defender |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 7.8 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 11:13 UTC
| Updated: 2026-06-23 11:13 UTC
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},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-noinfo Not enough information",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-02-04T19:22:35.635Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647"
}
],
"timeline": [
{
"lang": "en",
"time": "2021-11-03T00:00:00.000Z",
"value": "CVE-2021-1647 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:microsoft:system_center_endpoint_protection:-:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft System Center Endpoint Protection",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "N/A"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:r2:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft System Center 2012 R2 Endpoint Protection",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "N/A"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft Security Essentials",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "N/A"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:-:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft System Center 2012 Endpoint Protection",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "N/A"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:*"
],
"platforms": [
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows Server 2019",
"Windows Server 2019 (Server Core installation)",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows Server, version 1909 (Server Core installation)",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows Server, version 2004 (Server Core installation)",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows Server, version 20H2 (Server Core Installation)",
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows Server 2016",
"Windows Server 2016 (Server Core installation)",
"Windows 7 for 32-bit Systems Service Pack 1",
"Windows 7 for x64-based Systems Service Pack 1",
"Windows 8.1 for 32-bit systems",
"Windows 8.1 for x64-based systems",
"Windows RT 8.1",
"Windows Server 2008 for 32-bit Systems Service Pack 2",
"Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)",
"Windows Server 2008 R2 for x64-based Systems Service Pack 1",
"Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Windows Defender",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "N/A"
}
]
}
],
"datePublic": "2021-01-12T08:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Microsoft Defender Remote Code Execution Vulnerability"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Remote Code Execution",
"lang": "en-US",
"type": "Impact"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-10-08T16:17:02.566Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": "Microsoft Defender Remote Code Execution Vulnerability",
"tags": [
"vendor-advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647"
}
],
"title": "Microsoft Defender Remote Code Execution Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2021-1647",
"datePublished": "2021-01-12T19:42:01.000Z",
"dateReserved": "2020-12-02T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:35:30.058Z",
"state": "PUBLISHED"
},
"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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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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