Scripting Engine Memory Corruption Vulnerability
Summary
| CVE | CVE-2021-34448 |
|---|---|
| State | PUBLISHED |
| Assigner | microsoft |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-07-16 21:15:09 UTC |
| Updated | 2026-08-10 19:58:48 UTC |
| Description | Scripting Engine Memory Corruption Vulnerability |
Risk And Classification
Primary CVSS: v3.1 8.8 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS: 0.400620000 probability, percentile 0.984980000 (date 2026-08-11)
CISA KEV: Listed on 2021-11-03; due 2021-11-17; ransomware use Unknown
Problem Types: CWE-787 | Remote Code Execution | CWE-787 CWE-787 Out-of-bounds Write
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 6.8 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 6.8 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C |
| 2.0 | [email protected] | Primary | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
MediumAuthentication
NoneConfidentiality
CompleteIntegrity
CompleteAvailability
CompleteAV:N/AC:M/Au:N/C:C/I:C/A:C
CISA Known Exploited Vulnerability
| Vendor | Microsoft |
|---|---|
| Product | Windows |
| Name | Microsoft Windows Scripting Engine Memory Corruption Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | https://nvd.nist.gov/vuln/detail/CVE-2021-34448 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Microsoft | Windows 10 1507 | All | All | All | All |
| Operating System | Microsoft | Windows 10 1607 | All | All | All | All |
| Operating System | Microsoft | Windows 10 1809 | All | All | All | All |
| Operating System | Microsoft | Windows 10 1909 | All | All | All | All |
| Operating System | Microsoft | Windows 10 2004 | All | All | All | All |
| Operating System | Microsoft | Windows 10 20h2 | All | All | All | All |
| Operating System | Microsoft | Windows 10 21h1 | All | All | All | All |
| Operating System | Microsoft | Windows 7 | - | sp1 | All | All |
| Operating System | Microsoft | Windows 8.1 | - | All | All | All |
| Operating System | Microsoft | Windows Rt 8.1 | - | All | All | All |
| Operating System | Microsoft | Windows Server 2008 | r2 | sp1 | All | All |
| Operating System | Microsoft | Windows Server 2012 | - | All | All | All |
| Operating System | Microsoft | Windows Server 2012 | r2 | All | All | All |
| Operating System | Microsoft | Windows Server 2016 | All | All | All | All |
| Operating System | Microsoft | Windows Server 2019 | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Microsoft | Windows 10 Version 1507 | affected 10.0.10240.0 10.0.10240.19003 custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Windows 10 Version 1607 | affected 10.0.14393.0 10.0.14393.4530 custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Windows 10 Version 1809 | affected 10.0.17763.0 10.0.17763.2061 custom | 32-bit Systems, x64-based Systems |
| CNA | Microsoft | Windows 10 Version 1809 | affected 10.0.0 10.0.17763.2061 custom | ARM64-based Systems |
| CNA | Microsoft | Windows 10 Version 1909 | affected 10.0.0 10.0.18363.1679 custom | 32-bit Systems, ARM64-based Systems, x64-based Systems |
| CNA | Microsoft | Windows 10 Version 2004 | affected 10.0.0 10.0.19041.1110 custom | 32-bit Systems, ARM64-based Systems, x64-based Systems |
| CNA | Microsoft | Windows 10 Version 20H2 | affected 10.0.0 10.0.19042.1110 custom | 32-bit Systems, ARM64-based Systems |
| CNA | Microsoft | Windows 10 Version 21H1 | affected 10.0.0 10.0.19043.1110 custom | 32-bit Systems, ARM64-based Systems, x64-based Systems |
| CNA | Microsoft | Windows 7 | affected 6.1.0 6.1.7601.25661 custom | 32-bit Systems |
| CNA | Microsoft | Windows 7 Service Pack 1 | affected 6.1.0 6.1.7601.25661 custom | x64-based Systems |
| CNA | Microsoft | Windows 8.1 | affected 6.3.0 6.3.9600.20069 custom | 32-bit Systems, ARM64-based Systems, x64-based Systems |
| CNA | Microsoft | Windows Server 2008 R2 Service Pack 1 | affected 6.1.7601.0 6.1.7601.25661 custom | x64-based Systems |
| CNA | Microsoft | Windows Server 2012 | affected 6.2.9200.0 6.2.9200.23409 custom | x64-based Systems |
| CNA | Microsoft | Windows Server 2012 R2 | affected 6.3.9600.0 6.3.9600.20069 custom | x64-based Systems |
| CNA | Microsoft | Windows Server 2016 | affected 10.0.14393.0 10.0.14393.4530 custom | x64-based Systems |
| CNA | Microsoft | Windows Server 2019 | affected 10.0.17763.0 10.0.17763.2061 custom | x64-based Systems |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34448 | [email protected] | msrc.microsoft.com | Patch, Vendor Advisory |
| Security Update Guide - Microsoft Security Response Center | af854a3a-2127-422b-91ae-364da2661108 | portal.msrc.microsoft.com | Patch, Vendor Advisory |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2021-11-03T00:00:00.000Z | CVE-2021-34448 added to CISA KEV |