CVE-2021-33742 (GCVE-0-2021-33742)
Vulnerability from cvelistv5 – Published: 2021-06-08 22:46 – Updated: 2025-10-21 23:25- Remote Code Execution
- CWE-787 - Out-of-bounds Write
| URL | Tags |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1809 |
Affected:
10.0.0 , < 10.0.17763.1999
(custom)
cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999:*:*:*:*:*:arm64:* |
||
| Microsoft | Windows Server 2019 |
Affected:
10.0.0 , < 10.0.17763.1999
(custom)
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.1999:*:*:*:*:*:*:* |
||
| Microsoft | Windows 10 Version 1909 |
Affected:
10.0.0 , < 10.0.18363.1621
(custom)
cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1621:*:*:*:*:*:x64:* |
||
| Microsoft | Windows 10 Version 21H1 |
Affected:
10.0.0 , < 10.0.19043.1052
(custom)
cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:arm64:* cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:x86:* |
||
| Microsoft | Windows 10 Version 2004 |
Affected:
10.0.0 , < 10.0.19041.1052
(custom)
cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1052:*:*:*:*:*:x64:* |
||
| Microsoft | Windows 10 Version 20H2 |
Affected:
10.0.0 , < 10.0.19042.1052
(custom)
cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:arm64:* |
||
| Microsoft | Windows 10 Version 1507 |
Affected:
10.0.0 , < 10.0.10240.18967
(custom)
cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.18967:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.18967:*:*:*:*:*:x64:* |
||
| Microsoft | Windows 10 Version 1607 |
Affected:
10.0.0 , < 10.0.14393.4467
(custom)
cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467:*:*:*:*:*:x64:* |
||
| Microsoft | Windows Server 2016 |
Affected:
10.0.0 , < 10.0.14393.4467
(custom)
cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4467:*:*:*:*:*:*:* |
||
| Microsoft | Windows 7 |
Affected:
6.1.0 , < 6.1.7601.25632
(custom)
Affected: 6.1.0 , < publication (custom) cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x86:* |
||
| Microsoft | Windows 7 Service Pack 1 |
Affected:
6.1.0 , < 6.1.7601.25632
(custom)
Affected: 6.1.0 , < publication (custom) cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x64:* |
||
| Microsoft | Windows 8.1 |
Affected:
6.3.0 , < 6.3.9600.20045
(custom)
Affected: 6.3.0 , < 1.0.0.0 (custom) cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20045:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_8.1:1.0.0.0:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20045:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_8.1:1.0.0.0:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20045:*:*:*:*:*:*:* |
||
| Microsoft | Windows Server 2008 Service Pack 2 |
Affected:
6.0.0 , < 6.0.6003.21137
(custom)
Affected: 6.0.0 , < publication (custom) cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21137:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x64:* |
||
| Microsoft | Windows Server 2008 Service Pack 2 |
Affected:
6.0.0 , < 6.0.6003.21137
(custom)
Affected: 6.0.0 , < publication (custom) cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21137:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x86:* |
||
| Microsoft | Windows Server 2008 R2 Service Pack 1 |
Affected:
6.1.0 , < 6.1.7601.25632
(custom)
Affected: 6.1.0 , < publication (custom) cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25632:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2008_R2:*:*:*:*:*:*:x64:* |
||
| Microsoft | Windows Server 2012 |
Affected:
6.2.0 , < 6.2.9200.23372
(custom)
Affected: 6.2.0 , < 1.0.0.0 (custom) cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23372:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012:1.0.0.0:*:*:*:*:*:x64:* |
||
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.0 , < 6.3.9600.20045
(custom)
Affected: 6.3.0 , < 1.0.0.0 (custom) cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20045:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012_R2:1.0.0.0:*:*:*:*:*:x64:* |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
Exploited: Yes
Timestamps
Scope
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-787 CWE-823 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Windows |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Windows MSHTML Platform Remote Code Execution Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
Exploited: Yes
Timestamps
Scope
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Windows MSHTML Platform Remote Code Execution Vulnerability |
| Vendor | Microsoft |
| Product | Windows 10 Version 1809, Windows Server 2019, Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows 10 Version 20H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2012, Windows Server 2012 R2 |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 7.5 |
| 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
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"cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:arm64:*"
],
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"ARM64-based Systems"
],
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{
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},
{
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"cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.18967:*:*:*:*:*:x64:*"
],
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Windows 10 Version 1507",
"vendor": "Microsoft",
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{
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}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467:*:*:*:*:*:x64:*"
],
"platforms": [
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"x64-based Systems"
],
"product": "Windows 10 Version 1607",
"vendor": "Microsoft",
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{
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}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4467:*:*:*:*:*:*:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2016",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
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}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x86:*"
],
"platforms": [
"32-bit Systems"
],
"product": "Windows 7",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.1.7601.25632",
"status": "affected",
"version": "6.1.0",
"versionType": "custom"
},
{
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}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x64:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows 7 Service Pack 1",
"vendor": "Microsoft",
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{
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},
{
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"cpe:2.3:o:microsoft:windows_8.1:1.0.0.0:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20045:*:*:*:*:*:*:*"
],
"platforms": [
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"x64-based Systems",
"ARM64-based Systems"
],
"product": "Windows 8.1",
"vendor": "Microsoft",
"versions": [
{
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},
{
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]
},
{
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"cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x64:*"
],
"platforms": [
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],
"product": "Windows Server 2008 Service Pack 2",
"vendor": "Microsoft",
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{
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],
"platforms": [
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],
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{
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],
"platforms": [
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],
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"vendor": "Microsoft",
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{
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{
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"cpe:2.3:o:microsoft:windows_server_2012:1.0.0.0:*:*:*:*:*:x64:*"
],
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"x64-based Systems"
],
"product": "Windows Server 2012",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.2.9200.23372",
"status": "affected",
"version": "6.2.0",
"versionType": "custom"
},
{
"lessThan": "1.0.0.0",
"status": "affected",
"version": "6.2.0",
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}
]
},
{
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"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20045:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_server_2012_R2:1.0.0.0:*:*:*:*:*:x64:*"
],
"platforms": [
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],
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{
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{
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}
],
"datePublic": "2021-06-08T07:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Windows MSHTML Platform Remote Code Execution Vulnerability"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/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": "2024-05-29T14:55:49.884Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742"
}
],
"title": "Windows MSHTML Platform Remote Code Execution Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2021-33742",
"datePublished": "2021-06-08T22:46:44.000Z",
"dateReserved": "2021-05-28T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:42.892Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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.
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.
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.