Microsoft Windows Scripting Engine Memory Corruption Vulnerability

Added to KEV
2021-11-03
Federal due date
2021-11-17
Vendor
Microsoft
Product
Windows
EPSS
84.1th percentile (score 0.020, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2021-34448

CISA short description

Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.