CVE-2021-33627

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.

Category

8.2
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.19%
Vendor Advisory insyde.com Vendor Advisory insyde.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://www.insyde.com/security-pledge vendor advisory
https://www.insyde.com/security-pledge/SA-2022022 vendor advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf third party advisory
https://security.netapp.com/advisory/ntap-20220222-0002/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-33627?
CVE-2021-33627 has been scored as a high severity vulnerability.
How to fix CVE-2021-33627?
To fix CVE-2021-33627, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-33627 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-33627 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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