CVE-2023-25936

Memory disclosure via oversized UEFI variable

Published Jun 23, 2023 · Updated Nov 8, 2024

Improper input validation in Dell Client Platform BIOS allows local users to disclose firmware memory via an oversized UEFI variable. A DXE driver reuses the attacker-inflated SocketCommonRcConfig DataSize from GetVariable when SetVariable writes a fixed 114-byte buffer, copying adjacent stack or global memory into NVRAM. Administrator-level local access is required; the disclosure can expose firmware memory and assist a separate DXE memory-corruption exploit.

CVSS severity5.1
Medium
EPSS probability0.17%
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 Client Platform BIOS allows local users to disclose firmware memory via an oversized UEFI variable. A DXE driver reuses the attacker-inflated SocketCommonRcConfig DataSize from GetVariable when SetVariable writes a fixed 114-byte buffer, copying adjacent stack or global memory into NVRAM. Administrator-level local access is required; the disclosure can expose firmware memory and assist a separate DXE memory-corruption exploit.

The record

CVE
CVE-2023-25936
Published
Jun 23, 2023
Updated
Nov 8, 2024
Vendor
Dell
Product
Dell Client Platform BIOS
Classifications
CWE-20
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 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?

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  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Dell · Dell Client Platform BIOSversion=All versions

Published CVSS scores

6.0BinarlyCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
5.1DellCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L

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

CWE-20Improper Input Validation

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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