CVE-2022-23933

SMM code execution via unsafe Boot Services call

Published Mar 11, 2022 · Updated Aug 3, 2024

SMM callout in HP PC BIOS before 02.07.10 allows local users with kernel privileges to execute arbitrary code in System Management Mode. A child software-SMI handler invokes EFI Boot Services AllocatePool from SMRAM, allowing a modified service pointer to redirect privileged execution. Ring-0 access is required; successful exploitation reaches ring -2 and can bypass SPI flash protections to implant persistent firmware code.

CVSS severity8.2
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SMM callout in HP PC BIOS before 02.07.10 allows local users with kernel privileges to execute arbitrary code in System Management Mode. A child software-SMI handler invokes EFI Boot Services AllocatePool from SMRAM, allowing a modified service pointer to redirect privileged execution. Ring-0 access is required; successful exploitation reaches ring -2 and can bypass SPI flash protections to implant persistent firmware code.

The record

CVE
CVE-2022-23933
Published
Mar 11, 2022
Updated
Aug 3, 2024
Vendor
Plantronics
Product
HP PC BIOS
Classifications
T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 11, 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?

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

  1. Affected versionversion=before 02.07.10 (S05, S15 BIOS)

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Plantronics · HP PC BIOSversion=before 02.07.10 (S05, S15 BIOS)

Published CVSS scores

8.2HPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
8.2NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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