How severe is CVE-2021-41838?

CVE-2021-41838 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41838 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41838?

CVE-2021-41838 primarily affects Insyde Insydeh2o. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-41838?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-41838 published?

CVE-2021-41838 was published on 2022-02-03 and last updated on 2026-06-17.

CVE-2021-41838

CVE-2021-41838 is a high-severity vulnerability in Insyde Insydeh2o with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 7.2
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Insyde Insydeh2o
Published: 2022-02-03
Last modified: 2026-06-17

Description

An issue was discovered in SdHostDriver in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of a Numeric Range Comparison Without a Minimum Check.

Frequently asked questions

What is CVE-2021-41838?: An issue was discovered in SdHostDriver in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of a Numeric Range Comparison Without a Minimum Check.
How severe is CVE-2021-41838?: CVE-2021-41838 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41838 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41838?: CVE-2021-41838 primarily affects Insyde Insydeh2o. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-41838?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-41838 published?: CVE-2021-41838 was published on 2022-02-03 and last updated on 2026-06-17.

References

Affected products (15)

cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_field_pg_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_field_pg_m6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc127e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc227g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc277g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc327g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc377g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc427e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc477e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc627e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc647e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc677e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc847e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_itp1000_firmware:*:*:*:*:*:*:*:*

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