Is CVE-2021-41842 actively exploited?

No active exploitation of CVE-2021-41842 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-41842 be exploited remotely?

Yes. CVE-2021-41842 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-41842?

CVE-2021-41842 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-41842

CRITICAL

CVE-2021-41842

NVD-CWE-noinfoPublished: January 6, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in AtaLegacySmm in the kernel 5.0 before 05.08.46, 5.1 before 05.16.46, 5.2 before 05.26.46, 5.3 before 05.35.46, 5.4 before 05.43.46, and 5.5 before 05.51.45 in Insyde InsydeH2O. Code execution can occur because the SMI handler lacks a CommBuffer check.

NVD Source

Technical Analysis

CVE-2021-41842 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.