Is CVE-2021-34448 in the CISA KEV catalog?

Yes. CVE-2021-34448 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03.

What is the CVSS severity of CVE-2021-34448?

CVE-2021-34448 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2021-34448?

CVE-2021-34448 has an EPSS score of 26.67% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-34448

MEDIUMCISA KEVEPSS 98th pctl

6.8

CVSS v3

NVD

Description

Scripting Engine Memory Corruption Vulnerability

CWE-787Out-of-bounds Write

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Exploit Intelligence

26.67%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Windows Scripting Engine Memory Corruption Vulnerability

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

Apply updates per vendor instructions.

Remediation due: 2021-11-17

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-29.