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CVE

CVE-2021-33626

A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently

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.

HIGH · CVSS 7.8 EPSS 0.00078
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-829Inclusion of Functionality from Untrusted Control Sphere
▤

Affected Products & Versions

23
insyde insydeh2o>= 5.3 and < 5.34.44
insyde insydeh2o>= 5.2 and < 5.25.44
insyde insydeh2o>= 5.1 and < 5.16.25
insyde insydeh2o>= 5.4 and < 5.42.44
insyde insydeh2o>= 5.3 and < 5.35.25
insyde insydeh2o>= 5.2 and < 5.26.25
insyde insydeh2o>= 5.4 and < 5.43.25
siemens ruggedcom apr1808 firmwareall versions
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Oct 2021 · 03:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

1
siemens-csafSSA-306654
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220216-0006/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://www.insyde.com/security-pledge/SA-2021001Vendor Advisory
https://www.kb.cert.org/vuls/id/796611
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