CVE-2021-41842 is a critical code execution vulnerability affecting Insyde InsydeH2O firmware versions across multiple kernel branches (5.0-5.5). The flaw stems from a missing CommBuffer check in the AtaLegacySmm SMI handler, allowing unauthenticated attackers to execute arbitrary code. With a CVSS score of 9.8, this vulnerability presents a severe risk of complete compromise (confidentiality, integrity, availability). While no public exploits, Metasploit modules, or active exploitation have been observed, and community discussion is minimal, its high severity warrants attention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 5.0, < 05.08.46CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.1, < 05.16.46CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.2, < 05.26.46CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.3, < 05.35.46CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
> 5.4, < 05.43.46CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.