CVE-2021-41838
HIGHCVSS 8.2/10EPSS 0.30%
Last modified
CVE-2021-41838 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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. EPSS estimates a 0.30% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Insyde | Insydeh2o | >= 5.1, < 5.16.42 |
| Insyde | Insydeh2o | >= 5.2, < 5.26.42 |
| Insyde | Insydeh2o | >= 5.3, < 5.35.42 |
| Insyde | Insydeh2o | >= 5.4, < 5.43.42 |
| Insyde | Insydeh2o | >= 5.5, < 5.51.42 |
| Siemens | Simatic Field Pg M5 Firmware | All versions |
| Siemens | Simatic Field Pg M6 Firmware | All versions |
| Siemens | Simatic Ipc127e Firmware | All versions |
| Siemens | Simatic Ipc227g Firmware | All versions |
| Siemens | Simatic Ipc277g Firmware | All versions |
| Siemens | Simatic Ipc327g Firmware | All versions |
| Siemens | Simatic Ipc377g Firmware | All versions |
| Siemens | Simatic Ipc427e Firmware | All versions |
| Siemens | Simatic Ipc477e Firmware | All versions |
| Siemens | Simatic Ipc627e Firmware | All versions |
| Siemens | Simatic Ipc647e Firmware | All versions |
| Siemens | Simatic Ipc677e Firmware | All versions |
| Siemens | Simatic Ipc847e Firmware | All versions |
| Siemens | Simatic Itp1000 Firmware | All versions |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
- https://security.netapp.com/advisory/ntap-20220222-0001/Third Party Advisory
- https://www.insyde.com/security-pledgeVendor Advisory
- https://www.insyde.com/security-pledge/SA-2022023Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
- https://security.netapp.com/advisory/ntap-20220222-0001/Third Party Advisory
- https://www.insyde.com/security-pledgeVendor Advisory
- https://www.insyde.com/security-pledge/SA-2022023Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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 score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.
How do I fix CVE-2021-41838?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-41838?
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Scan your code nowSource: NVD / NIST