What’s Vulnerable › Vulnerabilities
CVE-2021-33625
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-02-03 · updated 2026-08-11
- Weakness: CWE-119
Description
An issue was discovered in Kernel 5.x in Insyde InsydeH2O, affecting HddPassword. 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.
Affected products
- Insydeh2O: from 5.1 before 5.16.23; from 5.2 before 5.26.23; from 5.3 before 5.35.23; from 5.4 before 5.43.22; from 5.5 before 5.51.22 — fixed in 5.16.23, 5.26.23, 5.35.23, 5.43.22, 5.51.22
- NetApp Fas/Aff Bios: all versions
- Siemens Ruggedcom Ape1808 Firmware: all versions
- 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 Ipc477E Pro 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
How to fix
Upgrade to a fixed version: Insydeh2O 5.16.23, 5.26.23, 5.35.23, 5.43.22. Check the vendor advisory for mitigations.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
- https://security.netapp.com/advisory/ntap-20220222-0004/
- https://www.insyde.com/security-pledge
- https://www.insyde.com/security-pledge/SA-2022014
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
- https://security.netapp.com/advisory/ntap-20220222-0004/
- https://www.insyde.com/security-pledge
- https://www.insyde.com/security-pledge/SA-2022014
- https://www.kb.cert.org/vuls/id/796611
- https://cert-portal.siemens.com/productcert/html/ssa-306654.html
Get alerted when CVE-2021-33625 or the next vulnerability affects your stack