ReviewHigh

CVE-2021-42279

Microsoft ChakraCore, Windows 10 Version 1507, Windows 10 Version 1607

CVE-2021-42279 affects Microsoft ChakraCore, Windows 10 Version 1507, Windows 10 Version 1607. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS: 7.5
EPSS: 2.18%
CISA KEV: Not listed
Published: 2021.11.10

PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability2.18%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Microsoft ChakraCore, Windows 10 Version 1507, Windows 10 Version 1607
Affected versions: >= 10.0.10240.0 < 10.0.10240.19119, >= 10.0.14393.0 < 10.0.14393.4770, >= 10.0.0 < 10.0.17763.2300, >= 10.0.17763.0 < 10.0.17763.2300, >= 10.0.0 < 10.0.18363.1916, >= 10.0.0 < 10.0.19041.1348, >= 10.0.0 < 10.0.19042.1348, >= 10.0.0 < 10.0.19043.1348, >= 10.0.22000.0 < 10.0.22000.318, >= 10.0.20348.0 < 10.0.20348.350, 20h2, 21h1, 1607, 1809, 1909, 2004
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Microsoft ChakraCore, Windows 10 Version 1507, Windows 10 Version 1607 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-787