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CVE-2026-20753: Escalation of Privilege in 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.

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High
VulnerabilityCVE-2026-20753cvecve-2026-20753
Published: Tue May 12 2026 (05/12/2026, 16:34:33 UTC)
Source: CVE Database V5
Product: 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.

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.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 05/12/2026, 17:51:36 UTC

Technical Analysis

This vulnerability involves an integer overflow in the UEFI firmware of the Slim Bootloader, which may be exploited by a privileged user through a local attack of low complexity. The attack does not require user interaction or special internal knowledge. Exploitation could enable local code execution, resulting in high impacts to confidentiality, integrity, and availability of the affected system. The CVSS 4.0 base score is 8.7, reflecting high severity with local attack vector, low attack complexity, privileged attack requirements, no user interaction, and high impacts across confidentiality, integrity, and availability.

Potential Impact

The vulnerability can lead to escalation of privilege and local code execution by a system software adversary with privileged user access. This may cause high impact on system confidentiality, integrity, and availability, potentially compromising the entire system's security posture.

Mitigation Recommendations

Patch status is not yet confirmed — no official fix or remediation level is provided in the available data. It is recommended to monitor the vendor advisory for updates on patches or mitigations. Until a fix is available, restrict privileged local access to trusted users only and apply any vendor-recommended temporary mitigations once published.

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Technical Details

Data Version
5.2
Assigner Short Name
intel
Date Reserved
2025-12-04T04:00:32.894Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a03656ccbff5d861008d8d3

Added to database: 5/12/2026, 5:37:48 PM

Last enriched: 5/12/2026, 5:51:36 PM

Last updated: 5/13/2026, 4:48:44 AM

Views: 5

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