CVE-2026-20712 in Reference Platforms
Summary
by MITRE • 08/11/2026
Incomplete cleanup in some UEFI firmware for some Intel(R) reference platforms within UEFI may allow an information disclosure. System software adversary with a privileged user combined with a low complexity attack may enable data exposure. 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 (none), integrity (none) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (none) and availability (none) impacts.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical information disclosure flaw within the Unified Extensible Firmware Interface firmware implementation of certain Intel reference platforms. The issue stems from incomplete cleanup operations during the UEFI firmware execution lifecycle, specifically affecting systems that utilize Intel's reference platform designs. The vulnerability creates a persistent security gap where sensitive data remnants may persist in memory or storage locations even after system operations have completed, potentially exposing confidential information to unauthorized parties.
The technical nature of this flaw aligns with CWE-1296, which addresses insufficient cleanup of firmware components, and represents a classic example of improper resource management within the firmware layer. Attackers with privileged user access can exploit this vulnerability through low complexity methods that require no special internal knowledge or user interaction, making it particularly dangerous in environments where such privileges may be compromised. The local access requirement means that an adversary must already have elevated system privileges or physical access to the target platform, though the attack vector itself remains relatively straightforward.
The operational impact of this vulnerability extends beyond simple data exposure, as it creates a persistent threat surface that could be exploited by sophisticated adversaries seeking long-term access to confidential information. The potential for confidentiality impact is rated as high because the vulnerability allows for the revelation of sensitive system data that may include cryptographic keys, authentication credentials, or other proprietary information stored within firmware memory regions. While the integrity and availability impacts are currently assessed as none, the potential for cascading effects exists if this information disclosure leads to further exploitation opportunities.
Security professionals should prioritize this vulnerability in their assessment protocols, particularly within environments utilizing Intel reference platforms where UEFI firmware components may be subject to incomplete cleanup operations. The recommended mitigation approaches include updating firmware to versions that address the specific cleanup implementation issues, implementing enhanced monitoring for unusual memory access patterns, and conducting thorough security audits of firmware components. Organizations should also consider applying microcode updates from Intel that specifically address this class of vulnerability, as well as establishing robust firmware integrity verification procedures. The ATT&CK framework would categorize this vulnerability under T1542.001 for "Pre-OS Boot" techniques, as it operates within the firmware layer before operating system execution begins.
This particular vulnerability demonstrates how firmware-level security flaws can create persistent threats that may remain undetected for extended periods, particularly in enterprise environments where firmware updates are not regularly performed or where legacy systems continue to operate without proper security maintenance. The lack of user interaction requirements and minimal attack complexity mean that this vulnerability represents a significant risk to organizations that have not yet addressed this specific firmware cleanup issue. Security teams should also consider the potential for supply chain implications, as compromised firmware components could affect multiple systems simultaneously if similar vulnerabilities exist across different manufacturers' implementations of Intel reference platforms.