CVE-2022-23956

Denial of service via unchecked SMI pointer

Published Mar 2, 2022 · Updated Aug 3, 2024

Denial of service in HP ProBook 440 G8 BIOS before 01.08.11 and ProDesk 405 G6 BIOS before 02.07.10 allows local users to interrupt operation. The 0155.efi SMI handler forwards an unvalidated communication-buffer pointer as a CopyMem destination, enabling attacker-directed SMRAM corruption. High local privileges are required; the corrupted protected firmware memory can deny service or support escalation into System Management Mode.

CVSS severity8.2
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in HP ProBook 440 G8 BIOS before 01.08.11 and ProDesk 405 G6 BIOS before 02.07.10 allows local users to interrupt operation. The 0155.efi SMI handler forwards an unvalidated communication-buffer pointer as a CopyMem destination, enabling attacker-directed SMRAM corruption. High local privileges are required; the corrupted protected firmware memory can deny service or support escalation into System Management Mode.

The record

CVE
CVE-2022-23956
Published
Mar 2, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.2HPCVSS:3.1/AV:L/AC:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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