CVE-2026-56435
Received Received - Intake

Out-of-Bounds Write in Intel Server Board UEFI Firmware

Publication date: 2026-11-10

Last updated on: 2026-11-10

Assigner: Intel Corporation

Description
Out-of-bounds write in the XmlCliCommonDxe for the Intel(R) Server Board D50DNP and Intel(R) Server Board M50FCP within Ring 0 UEFI may allow an escalation of privilege. Startup code and smm 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 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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Meta Information

Published
2026-11-10
Last Modified
2026-11-10
Generated
2026-11-10
AI Q&A
2026-11-10
EPSS Evaluated
N/A
NVD
CVE-2026-56435
EUVD
EUVD-2026-121672

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
intel server_board_d50dnp *
intel server_board_m50fcp *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This is an out-of-bounds write vulnerability in the XmlCliCommonDxe component for specific Intel server boards (D50DNP and M50FCP). It exists in Ring 0 UEFI, allowing privilege escalation. An attacker with privileged user access and startup code or SMM privileges could exploit this to execute local code, even without special internal knowledge or user interaction.

Impact Analysis

This vulnerability may allow an attacker to gain high-level access to your system, potentially leading to complete control over the machine. It could result in unauthorized data access, modification, or deletion, and may disrupt system operations entirely.

Compliance Impact

This vulnerability could lead to severe confidentiality, integrity, and availability impacts, which may violate compliance requirements under GDPR, HIPAA, and other regulations. Unauthorized access or data breaches could result in legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Apply firmware updates from Intel for affected Server Board D50DNP and M50FCP systems to patch the XmlCliCommonDxe out-of-bounds write vulnerability. Ensure secure boot is enabled and restrict physical and administrative access to systems.

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