CVEs / CVE-2021-34448
CVE-2021-34448: Microsoft Windows Scripting Engine Memory Corruption Vulnerability
- Known exploited in the CISA KEV catalog since 3 Nov 2021
- high 9.3 CVSS 2.0 (NVD)
- EPSS 40% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption.
Description
Scripting Engine Memory Corruption Vulnerability
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1507 | from 10.0.10240.0, before 10.0.10240.19003 | 10.0.10240.19003 |
| Microsoft Windows 10 Version 1607 | from 10.0.14393.0, before 10.0.14393.4530 | 10.0.14393.4530 |
| Microsoft Windows 10 Version 1809 | from 10.0.17763.0, before 10.0.17763.2061 | 10.0.17763.2061 |
| Microsoft Windows 10 Version 1809 | from 10.0.0, before 10.0.17763.2061 | 10.0.17763.2061 |
| Microsoft Windows 10 Version 1909 | from 10.0.0, before 10.0.18363.1679 | 10.0.18363.1679 |
| Microsoft Windows 10 Version 2004 | from 10.0.0, before 10.0.19041.1110 | 10.0.19041.1110 |
| Microsoft Windows 10 Version 20H2 | from 10.0.0, before 10.0.19042.1110 | 10.0.19042.1110 |
| Microsoft Windows 10 Version 21H1 | from 10.0.0, before 10.0.19043.1110 | 10.0.19043.1110 |
| Microsoft Windows 7 | from 6.1.0, before 6.1.7601.25661 | 6.1.7601.25661 |
| Microsoft Windows 7 Service Pack 1 | from 6.1.0, before 6.1.7601.25661 | 6.1.7601.25661 |
| Microsoft Windows 8.1 | from 6.3.0, before 6.3.9600.20069 | 6.3.9600.20069 |
| Microsoft Windows Server 2008 R2 Service Pack 1 | from 6.1.7601.0, before 6.1.7601.25661 | 6.1.7601.25661 |
| Microsoft Windows Server 2012 | from 6.2.9200.0, before 6.2.9200.23409 | 6.2.9200.23409 |
| Microsoft Windows Server 2012 R2 | from 6.3.9600.0, before 6.3.9600.20069 | 6.3.9600.20069 |
| Microsoft Windows Server 2016 | from 10.0.14393.0, before 10.0.14393.4530 | 10.0.14393.4530 |
| Microsoft Windows Server 2019 | from 10.0.17763.0, before 10.0.17763.2061 | 10.0.17763.2061 |
Exploitation
| In CISA KEV since | 3 Nov 2021 |
|---|---|
| Due date for US federal agencies | 17 Nov 2021 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 2.0 | 9.3 highAV:N/AC:M/Au:N/C:C/I:C/A:CScored by NVD |
|---|---|
| Weakness | CWE-787 |
References
- CVE-2021-34448 on NVD
- CVE-2021-34448 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34448 Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34448 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.