CVE-2022-34393

SMRAM code execution via improperly validated SMI

Published Jan 18, 2023 · Updated Apr 3, 2025

Improper input validation in Dell BIOS allows local authenticated users to execute arbitrary code in SMRAM through a crafted SMI. Dell has not disclosed the affected SMI handler, input field, or precise validation error beyond identifying improper input validation. Exploitation requires local high-privileged access and a high-complexity SMI path that crosses into protected System Management Mode memory.

CVSS severity7.5
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Dell BIOS allows local authenticated users to execute arbitrary code in SMRAM through a crafted SMI. Dell has not disclosed the affected SMI handler, input field, or precise validation error beyond identifying improper input validation. Exploitation requires local high-privileged access and a high-complexity SMI path that crosses into protected System Management Mode memory.

The record

CVE
CVE-2022-34393
Published
Jan 18, 2023
Updated
Apr 3, 2025
Vendor
Dell
Product
Dell BIOS
Classifications
CWE-20, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.17.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Dell · Dell BIOSversion=0 <=2.17.0

Published CVSS scores

7.5DellCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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