CVE-2021-34448 (GCVE-0-2021-34448)
Vulnerability from cvelistv5 – Published: 2021-07-16 20:19 – Updated: 2025-10-21 23:25Title
Scripting Engine Memory Corruption Vulnerability
Summary
Scripting Engine Memory Corruption Vulnerability
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- Remote Code Execution
- CWE-787 - Out-of-bounds Write
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
15 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 |
Affected:
10.0.0 , < 10.0.17763.2061
(custom)
cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2061:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2061:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2061:*:*:*:*:*:arm64:* |
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.0 , < 10.0.17763.2061
(custom)
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2061:*:*:*:*:*:*:* |
|
| Microsoft | Windows 10 Version 1909 |
Affected:
10.0.0 , < 10.0.18363.1679
(custom)
cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1679:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1679:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1679:*:*:*:*:*:x64:* |
|
| Microsoft | Windows 10 Version 21H1 |
Affected:
10.0.0 , < 10.0.19043.1110
(custom)
cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1110:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1110:*:*:*:*:*:arm64:* cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1110:*:*:*:*:*:x86:* |
|
| Microsoft | Windows 10 Version 2004 |
Affected:
10.0.0 , < 10.0.19041.1110
(custom)
cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1110:*:*:*:*:*:x64:* |
|
| Microsoft | Windows 10 Version 20H2 |
Affected:
10.0.0 , < 10.0.19042.1110
(custom)
cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1110:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1110:*:*:*:*:*:arm64:* |
|
| Microsoft | Windows 10 Version 1507 |
Affected:
10.0.0 , < 10.0.10240.19003
(custom)
cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19003:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19003:*:*:*:*:*:x64:* |
|
| Microsoft | Windows 10 Version 1607 |
Affected:
10.0.0 , < 10.0.14393.4530
(custom)
cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4530:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4530:*:*:*:*:*:x64:* |
|
| Microsoft | Windows Server 2016 |
Affected:
10.0.0 , < 10.0.14393.4530
(custom)
cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4530:*:*:*:*:*:*:* |
|
| Microsoft | Windows 7 |
Affected:
6.1.0 , < 6.1.7601.25661
(custom)
Affected: 6.1.0 , < 1.001 (custom) cpe:2.3:o:microsoft:windows_7:6.1.7601.25661:sp1:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x86:* |
|
| Microsoft | Windows 7 Service Pack 1 |
Affected:
6.1.0 , < 6.1.7601.25661
(custom)
Affected: 6.1.0 , < 1.001 (custom) cpe:2.3:o:microsoft:windows_7:6.1.7601.25661:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x64:* |
|
| Microsoft | Windows 8.1 |
Affected:
6.3.0 , < 6.3.9600.20069
(custom)
Affected: 6.3.0 , < 1.001 (custom) cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20069:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20069:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20069:*:*:*:*:*:*:* |
|
| Microsoft | Windows Server 2008 R2 Service Pack 1 |
Affected:
6.1.0 , < 6.1.7601.25661
(custom)
Affected: 6.1.0 , < 1.001 (custom) cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25661:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:* |
|
| Microsoft | Windows Server 2012 |
Affected:
6.2.0 , < 6.2.9200.23409
(custom)
Affected: 6.2.0 , < 1.001 (custom) cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23409:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:* |
|
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.0 , < 6.3.9600.20069
(custom)
Affected: 6.3.0 , < 1.001 (custom) cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20069:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:* |
Date Public
2021-07-13 07:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5057e5ec-e8df-4678-8e49-0c2eb3a9455e
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Microsoft Windows Scripting Engine Memory Corruption Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption. | 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-2021-34448
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-787 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Windows |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Windows Scripting Engine Memory Corruption Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:28 UTC
| Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 56feae99-cc38-44cd-8dae-d283d928c403
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: Scripting Engine Memory Corruption Vulnerability | Affected: Microsoft / 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 R2 Service Pack 1, Windows Server 2012, Windows Server 2012 R2 | CVSS: 6.8 (MEDIUM) | 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 | Scripting Engine Memory Corruption 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 R2 Service Pack 1, Windows Server 2012, Windows Server 2012 R2 |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 6.8 |
| Epss Score | None |
| Cvss Severity | MEDIUM |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-19 12:48 UTC
| Updated: 2026-06-19 12:48 UTC
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\"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23409:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2012\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"6.2.9200.23409\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20069:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2012 R2\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"6.3.9600.20069\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}], \"datePublic\": \"2021-07-13T07:00:00.000Z\", \"references\": [{\"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Scripting Engine Memory Corruption Vulnerability\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"Impact\", \"description\": \"Remote Code Execution\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2023-12-28T22:36:36.535Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-34448\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:25:40.227Z\", \"dateReserved\": \"2021-06-09T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-07-16T20:19:39.000Z\", \"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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