High severity · published Oct 1, 2021
CVE-2021-33626
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…
7.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IN
Insydeh2o · Insyde
5.3 before 5.34.44; 5.2 before 5.25.44; 5.1 before 5.16.25; 5.4 before 5.42.44; 5.3 before 5.35.25; 5.2 before 5.26.25; +1 more · source: NVD
RA
Ruggedcom Apr1808 Firmware · Siemens
All versions, or not specified · source: NVD
SF
Simatic Field PG M5 Firmware · Siemens
All versions, or not specified · source: NVD
SF
Simatic Field PG M6 Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc127e Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc227g Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc277g Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc327g Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc377g Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc427e Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc477e Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc477e Pro Firmware · Siemens
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33626
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33626
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
www.kb.cert.org
https://www.kb.cert.org/vuls/id/796611
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-306654.html
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