CVE-2021-33626

moderate-risk
Published 2021-10-01

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.

Do I need to act?

-
0.08% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (17)

Ruggedcom Apr1808 Firmware
Simatic Field Pg M6 Firmware
Simatic Ipc127E Firmware
Simatic Ipc227G Firmware
Simatic Ipc277G Firmware
Simatic Ipc327G Firmware
Simatic Ipc377G Firmware
Simatic Ipc477E Pro Firmware
Simatic Ipc627E Firmware
Simatic Ipc647E Firmware
Simatic Ipc677E Firmware
Simatic Ipc847E Firmware

Affected Vendors

Siemens Insyde

References (9)

Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
Third Party Advisory https://security.netapp.com/advisory/ntap-20220216-0006/
Vendor Advisory https://www.insyde.com/security-pledge
Vendor Advisory https://www.insyde.com/security-pledge/SA-2021001
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
Third Party Advisory https://security.netapp.com/advisory/ntap-20220216-0006/
Vendor Advisory https://www.insyde.com/security-pledge
Vendor Advisory https://www.insyde.com/security-pledge/SA-2021001
https://www.kb.cert.org/vuls/id/796611
43
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 0/34 · Minimal
Exposure 19/34 · Moderate