CVE-2022-35408

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2022-09-23. NVD baseline CVSS 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, nvd
Elevated
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. An SMM callout vulnerability in the SMM driver in UsbLegacyControlSmm leads to possible arbitrary code execution in SMM and escalation of privileges. An attacker could overwrite the function pointers in the EFI_BOOT_SERVICES table before the USB SMI handler triggers. (This is not exploitable from code running in the operating system.)

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
26.5%
KEV
Not listed

Published

September 22, 2022

Last Modified

May 27, 2025

References (6)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:06 UTCEPSS rescore
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  74. 2026-05-23 09:15 UTCEG score recompute
  75. 2026-05-23 09:15 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2022-35408?
CVE-2022-35408 is a high vulnerability published on September 22, 2022. An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. An SMM callout vulnerability in the SMM driver in UsbLegacyControlSmm leads to possible arbitrary code execution in SMM and escalation of privileges. An attacker could overwrite the function pointers in the EFIBOOTSERVICES…
When was CVE-2022-35408 disclosed?
CVE-2022-35408 was first published in the National Vulnerability Database on September 22, 2022, with the most recent update on May 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-35408 actively exploited?
CVE-2022-35408 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-35408?
CVE-2022-35408 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2022-35408?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-35408, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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