CVE-2026-20753

Integer Overflow in UEFI Slim Bootloader Allowing Privilege Escalation

Published May 12, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Integer Overflow in UEFI Slim Bootloader Allowing Privilege Escalation
First Time appeared Intel
Intel slim Bootloader
Vendors & Products Intel
Intel slim Bootloader
Type Values Removed Values Added
Description 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.
Weaknesses CWE-190
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
intel
Published
Updated
May 13, 2026, 3:57 AM
Reserved
Dec 4, 2025, 4:00 AM
Status
Awaiting Analysis
Published
May 12, 2026, 5:16 PM
Modified
Jun 17, 2026, 10:17 AM