CVE-2022-31646

SMM code execution via unchecked WStringCopy writes

Published Jun 14, 2023 · Updated Dec 30, 2024

SMM memory corruption in HP PC BIOS allows local users with privileged DXE-phase code execution to run arbitrary code in System Management Mode. The child software SMI handler invokes WStringCopy repeatedly without validating attacker-controlled data, enabling out-of-bounds writes into SMRAM. Exploitation requires code execution during the DXE phase and can elevate firmware execution into SMM, enabling persistent BIOS modification.

CVSS severity8.2
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SMM memory corruption in HP PC BIOS allows local users with privileged DXE-phase code execution to run arbitrary code in System Management Mode. The child software SMI handler invokes WStringCopy repeatedly without validating attacker-controlled data, enabling out-of-bounds writes into SMRAM. Exploitation requires code execution during the DXE phase and can elevate firmware execution into SMM, enabling persistent BIOS modification.

The record

CVE
CVE-2022-31646
Published
Jun 14, 2023
Updated
Dec 30, 2024
Vendor
Plantronics
Product
HP PC BIOS
Classifications
CWE-787, CWE-863, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=See HP Security Bulletin reference for affected versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Plantronics · HP PC BIOSversion=See HP Security Bulletin reference for affected versions

Published CVSS scores

8.2BinarlyCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.2HP Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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 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

CWE-787Out-of-bounds Write
CWE-863Incorrect Authorization
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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