CVE-2021-33626

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.08%
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-2021001 vendor advisory
https://security.netapp.com/advisory/ntap-20220216-0006/ third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-33626?
CVE-2021-33626 has been scored as a high severity vulnerability.
How to fix CVE-2021-33626?
To fix CVE-2021-33626, 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-2021-33626 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-33626 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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