Slim Bootloader May Allow An Escalation Of Privilege System Software Adversary With A Privileged User Combined With A Low Complexity Attack May Enable Local Code Execution This Result May Potentially Occur Via Local Access When Attack Requirements Are 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 CVE-2026-20753

Q: What is the CVSS score of CVE-2026-20753?

CVE-2026-20753 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-29524 HIGH

Integer Overflow or Wraparound (CWE-190)

2026-05-12 intel

GHSA-q695-vc4p-4hjx

Integer Overflow Privilege Escalation RCE Slim Bootloader May Allow An Escalation Of Privilege System Software Adversary With A Privileged User Combined With A Low Complexity Attack May Enable Local Code Execution This Result May Potentially Occur Via Local Access When Attack Requirements Are 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

8.7

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.7 HIGH

CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

May 12, 2026 - 17:22 NVD

8.7 (HIGH)

CVE Published

May 12, 2026 - 16:34 nvd

HIGH 8.7

CVE Published

May 12, 2026 - 16:34 nvd

UNKNOWN (no severity yet)

DescriptionCVE.org

Integer overflow in the UEFI firmware for the Slim Bootloader may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are 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.