Improper Input Validation in UEFI FlashUcAcmSmm Module for Intel Platforms
CVE-2025-20064

8.7HIGH

Key Information:

Vendor

Intel
Status
Intel(r) Reference Platforms May Allow An Escalation Of Privilege. System Software Adversary With A Privileged User Combined With A High Complexity Attack May Enable Local Code Execution. This Result May Potentially Occur Via Local Access When Attack Requirements Are Not Present Without Special Internal Knowledge And Requires No User Interaction. The Potential Vulnerability May Impact The Confidentiality (high), Integrity (high) And Availability (high) Of The Vulnerable System, Resulting In Subsequent System Confidentiality (high), Integrity (high) And Availability (high) Impacts.
Vendor
CVE Published:
10 March 2026

What is CVE-2025-20064?

The UEFI FlashUcAcmSmm module for certain Intel reference platforms contains an improper input validation flaw. This vulnerability can be exploited by an adversary with system software access and a privileged user role. By leveraging a complex attack method, local code execution may be achievable, potentially yielding unauthorized privilege escalation. Importantly, this exploitation requires local access to the system and does not necessitate any user interaction, allowing attackers to exploit the vulnerability with a degree of stealth. As a consequence, it poses significant risks to the confidentiality, integrity, and availability of the affected systems.

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Affected Version(s)

Intel(R) reference platforms may allow an escalation of privilege. System software adversary with a privileged user combined with a high complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts. See references

References

https://intel.com/content/www/us/en/security-center/advis...

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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