CVE-2025-20082

Privilege escalation via SmiVariable TOCTOU race

Published May 13, 2025 · Updated Feb 26, 2026

A TOCTOU race in Intel Server Board D50DNP and M50FCP UEFI before R01.02.0003 allows local users to escalate privileges. The SmiVariable driver checks firmware state and later uses that state without ensuring it remains unchanged, but Intel has not disclosed the exact operation or input involved. Exploitation requires high local privileges, high-complexity race timing, and an additional runtime condition; success grants privileges beyond those already held.

CVSS severity8.7
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A TOCTOU race in Intel Server Board D50DNP and M50FCP UEFI before R01.02.0003 allows local users to escalate privileges. The SmiVariable driver checks firmware state and later uses that state without ensuring it remains unchanged, but Intel has not disclosed the exact operation or input involved. Exploitation requires high local privileges, high-complexity race timing, and an additional runtime condition; success grants privileges beyond those already held.

The record

CVE
CVE-2025-20082
Published
May 13, 2025
Updated
Feb 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-367, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record 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

8.7Intel CorporationCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
7.5Intel CorporationCVSS:3.1/AV:L/AC:H/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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
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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