Vulnerability Description
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Insyde | Insydeh2O | >= 5.0, < 5.08.29 |
| Siemens | Simatic Field Pg M5 Firmware | All versions |
| Siemens | Simatic Field Pg M5 | - |
| Siemens | Simatic Field Pg M6 Firmware | All versions |
| Siemens | Simatic Field Pg M6 | - |
| Siemens | Simatic Ipc127E Firmware | All versions |
| Siemens | Simatic Ipc127E | - |
| Siemens | Simatic Ipc227G Firmware | All versions |
| Siemens | Simatic Ipc227G | - |
| Siemens | Simatic Ipc277G Firmware | All versions |
| Siemens | Simatic Ipc277G | - |
| Siemens | Simatic Ipc327G Firmware | All versions |
| Siemens | Simatic Ipc327G | - |
| Siemens | Simatic Ipc377G Firmware | All versions |
| Siemens | Simatic Ipc377G | - |
| Siemens | Simatic Ipc427E Firmware | All versions |
| Siemens | Simatic Ipc427E | - |
| Siemens | Simatic Ipc477E Firmware | All versions |
| Siemens | Simatic Ipc477E | - |
| Siemens | Simatic Ipc627E Firmware | All versions |
Related Weaknesses (CWE)
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
- https://security.netapp.com/advisory/ntap-20220222-0002/Third Party Advisory
- https://www.insyde.com/security-pledgeVendor Advisory
- https://www.insyde.com/security-pledge/SA-2022022Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
- https://security.netapp.com/advisory/ntap-20220222-0002/Third Party Advisory
- https://www.insyde.com/security-pledgeVendor Advisory
- https://www.insyde.com/security-pledge/SA-2022022Vendor Advisory
- https://www.kb.cert.org/vuls/id/796611
FAQ
What is CVE-2021-33627?
CVE-2021-33627 is a vulnerability with a CVSS score of 8.2 (HIGH). An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockSer...
How severe is CVE-2021-33627?
CVE-2021-33627 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-33627?
Check the references section above for vendor advisories and patch information. Affected products include: Insyde Insydeh2O, Siemens Simatic Field Pg M5 Firmware, Siemens Simatic Field Pg M5, Siemens Simatic Field Pg M6 Firmware, Siemens Simatic Field Pg M6.