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Improper Input ValidationWeakness · CWE-20

CVE-2025-20034

MEDIUM · 5.3 CVSS v3.1 Published 2025-05-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
55/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Improper input validation in the BackupBiosUpdate UEFI firmware SmiVariable driver for the Intel(R) Server D50DNP and M50FCP boards before version R01.02.0003 may allow a privileged user to potentially enable information disclosure via local access.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A vulnerability in the BackupBiosUpdate UEFI firmware SmiVariable driver of Intel Server D50DNP and M50FCP boards allows improper input validation that may be exploited by a privileged local user to disclose information. The issue exists in versions prior to R01.02.0003.

MitigationUpdate the UEFI firmware on affected Intel Server D50DNP and M50FCP boards to version R01.02.0003 or later to remediate this vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
High
Privileges
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the Intel server board model
    Check the server chassis, system board label, or use IPMI/dmidecode to retrieve the board product name. Look for "D50DNP" or "M50FCP" in the output.
    Affected if The board model is Intel Server D50DNP or M50DNP, or M50FCP.
  2. Retrieve the current UEFI firmware version
    Access the BIOS/UEFI setup utility during boot and navigate to the Main or Advanced tab to view the BIOS version. Alternatively, use IPMI command 'ipmitool raw' or the BMC web interface to query the firmware version, or run 'dmidecode -s bios-version' on the operating system.
    Affected if A UEFI firmware version is returned from the system.
  3. Compare the installed version against R01.02.0003
    Compare the firmware version string obtained in the previous step to the reference version R01.02.0003 using standard version comparison. Versions earlier than R01.02.0003 (for example, R01.01.0001, R01.00.XXXX) are considered vulnerable.
    Affected if The installed firmware version is lower than R01.02.0003 (for example, R01.01.XXXX or any pre-R01.02 release).
  4. Verify the BackupBiosUpdate feature is present
    Check the UEFI firmware configuration or the BMC firmware logs for references to "BackupBiosUpdate" or "SmiVariable" driver. This driver is typically included in the UEFI firmware image on affected boards.
    Affected if The BackupBiosUpdate driver or SmiVariable component is listed in the UEFI firmware or BMC diagnostics.

The system is affected if it is an Intel D50DNP or M50FCP board running UEFI firmware version prior to R01.02.0003 with the BackupBiosUpdate/SmiVariable driver present.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update the UEFI firmware on affected Intel Server D50DNP and M50FCP boards to version R01.02.0003 or later to remediate this vulnerability.

Recommended fix High confidence

R01.02.0003

  1. 1. Identify the current firmware version of the Intel(R) Server D50DNP or M50FCP board by accessing the BIOS/UEFI setup or using Intel's server management tools
  2. 2. Navigate to the Intel support website (intel.com) and locate the drivers and support page for your specific server board
  3. 3. Download the BIOS/firmware update package version R01.02.0003 or later for your board model
  4. 4. Review the firmware update instructions provided by Intel for your specific board
  5. 5. Apply the firmware update following Intel's recommended procedure, typically through the Intel Embedded Server Management interface or BIOS flash utility
  6. 6. Verify the firmware has been successfully updated to version R01.02.0003 or later
Caveat Firmware updates carry inherent risk; ensure proper power backup and follow Intel's update procedure exactly to avoid rendering the board unusable

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-20034 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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