CVSS 3.1
7.8 highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2021-33626
High (7.8). EPSS 0.3% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-31)
- CWE
- CWE-829
- Published
- Modified
- Record from
- the NVD, synced
Affected
- insyde:insydeh2o
- siemens:ruggedcom_apr1808_firmware
- siemens:simatic_field_pg_m5_firmware
- siemens:simatic_field_pg_m6_firmware
- siemens:simatic_ipc127e_firmware
- siemens:simatic_ipc227g_firmware
- siemens:simatic_ipc277g_firmware
- siemens:simatic_ipc327g_firmware
- siemens:simatic_ipc377g_firmware
- siemens:simatic_ipc427e_firmware
- siemens:simatic_ipc477e_firmware
- siemens:simatic_ipc477e_pro_firmware
- siemens:simatic_ipc627e_firmware
- siemens:simatic_ipc647e_firmware
- siemens:simatic_ipc677e_firmware
- siemens:simatic_ipc847e_firmware
- siemens:simatic_itp1000_firmware