CVE-2025-3770

SMM code execution via premature MCE enablement

Published Aug 7, 2025 · Updated Aug 7, 2025

Privilege escalation in TianoCore EDK II through edk2-stable202505 allows local users to execute arbitrary code in SMM. X64/SmiEntry.nasm enables Machine Check Exceptions before installing the SMM exception handler, so an early exception reaches an untrusted handler. Exploitation requires low-privileged local access, a susceptible X64 platform, and a machine check during the initialization window, granting firmware-level control.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in TianoCore EDK II through edk2-stable202505 allows local users to execute arbitrary code in SMM. X64/SmiEntry.nasm enables Machine Check Exceptions before installing the SMM exception handler, so an early exception reaches an untrusted handler. Exploitation requires low-privileged local access, a susceptible X64 platform, and a machine check during the initialization window, granting firmware-level control.

The record

CVE
CVE-2025-3770
Published
Aug 7, 2025
Updated
Aug 7, 2025
Vendor
TianoCore
Product
EDK II
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2025Record 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=0 <=edk2-stable202505

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

TianoCore · EDK IIversion=0 <=edk2-stable202505

Published CVSS scores

7.0TianoCoreCVSS:3.1/AV:L/AC:H/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.

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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
Privilegesauthenticated
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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