CVE-2021-33626
High
Description
A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.
SeverityHigh
CVSS7.8
Exploit probability—
ProductInsydeh2o
PublishedOct 1, 2021
First seenOct 1, 2021
How to fix
Update
- insyde insydeh2o5.34.44, 5.25.44, 5.16.25, 5.42.44, 5.35.25, 5.26.25, 5.43.25 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| insyde insydeh2o | 5.3 ≤ v < 5.34.44, 5.2 ≤ v < 5.25.44, 5.1 ≤ v < 5.16.25, 5.4 ≤ v < 5.42.44, 5.3 ≤ v < 5.35.25, 5.2 ≤ v < 5.26.25, 5.4 ≤ v < 5.43.25 | 5.34.44, 5.25.44, 5.16.25, 5.42.44, 5.35.25, 5.26.25, 5.43.25 |
| siemens ruggedcom_apr1808_firmware | No range specified | — |
| siemens simatic_field_pg_m5_firmware | No range specified | — |
| siemens simatic_field_pg_m6_firmware | No range specified | — |
| siemens simatic_ipc127e_firmware | No range specified | — |
| siemens simatic_ipc227g_firmware | No range specified | — |
| siemens simatic_ipc277g_firmware | No range specified | — |
| siemens simatic_ipc327g_firmware | No range specified | — |
| siemens simatic_ipc377g_firmware | No range specified | — |
| siemens simatic_ipc427e_firmware | No range specified | — |
| siemens simatic_ipc477e_firmware | No range specified | — |
| siemens simatic_ipc477e_pro_firmware | No range specified | — |
| siemens simatic_ipc627e_firmware | No range specified | — |
| siemens simatic_ipc647e_firmware | No range specified | — |
| siemens simatic_ipc677e_firmware | No range specified | — |
| siemens simatic_ipc847e_firmware | No range specified | — |
| siemens simatic_itp1000_firmware | No range specified | — |
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