CVE-2021-43323

moderate-risk
Published 2022-02-03

An issue was discovered in UsbCoreDxe in Insyde InsydeH2O with kernel 5.5 before 05.51.45, 5.4 before 05.43.45, 5.3 before 05.35.45, 5.2 before 05.26.45, 5.1 before 05.16.45, and 5.0 before 05.08.45. An SMM callout vulnerability allows an attacker to hijack execution flow of code running in System Management Mode. Exploiting this issue could lead to escalating privileges to SMM.

Do I need to act?

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0.12% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.2/10 High
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Insyde

References (7)

Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
Third Party Advisory https://security.netapp.com/advisory/ntap-20220217-0013/
Vendor Advisory https://www.insyde.com/security-pledge
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
Third Party Advisory https://security.netapp.com/advisory/ntap-20220217-0013/
Vendor Advisory https://www.insyde.com/security-pledge
https://www.kb.cert.org/vuls/id/796611
31
/ 100
moderate-risk
Severity 25/34 · High
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal