CVE-2021-43221

Medium

Published: 24 November 2021

Published

24 November 2021

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS Score 0.0086 75.4th percentile

Risk Priority 9 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-43221 is a medium-severity Code Injection (CWE-94) vulnerability in Microsoft Edge Chromium. Its CVSS base score is 4.2 (Medium).

Operationally, ranked in the top 24.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

microsoft

edge chromium

≤ 96.0.1054.29

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-94

Makes persistent code injection into loaded programs impossible when the executable image itself resides on hardware-protected read-only media.

addresses: CWE-94

Dynamically generated code can be produced and executed inside the isolated chamber, preventing host compromise from code-injection payloads.

addresses: CWE-94

Validates inputs used in dynamic code generation to block injected directives.

addresses: CWE-94

Directly prevents execution of attacker-supplied code written into data memory regions.