High severity · published Feb 3, 2022
CVE-2021-33627
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11…
8.2
CVSS
0.3%
EPSS
No
On KEV
Description
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IN
Insydeh2o · Insyde
5.0 before 5.08.29; 5.1 before 5.16.29; 5.2 before 5.26.29; 5.3 before 5.35.29 · 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 Ipc627e Firmware · Siemens
All versions, or not specified · source: NVD
SI
Simatic Ipc647e Firmware · Siemens
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33627
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33627
Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220222-0002/
Vendor Advisory
https://www.insyde.com/security-pledge
Vendor Advisory
https://www.insyde.com/security-pledge/SA-2022022
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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