EUVD-2026-56521
GHSA-2vr7-p3pm-fxwj
Severity by source
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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
Local-only vector and high privileges required per CVSS 4.0 source; no C/I impact confirmed; unchanged scope with low availability impact only.
Primary rating from Vendor (intel).
CVSS VectorVendor: intel
Lifecycle Timeline
1DescriptionCVE.org
Out-of-bounds write in the firmware for the Intel(R) Slim Bootloader may allow a denial of service. System software adversary with a privileged user combined with a low complexity attack may enable denial of service. 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 (low) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
AnalysisAI
Out-of-bounds write (CWE-787) in Intel Slim Bootloader firmware enables a denial of service condition on the local system. Exploitation requires a privileged local account and the presence of specific attack preconditions (AT:P per CVSS 4.0), and impact is confined to low availability on the vulnerable system with no confidentiality or integrity consequences. Intel disclosed this issue through advisory INTEL-SA-01475 with a CVSS 4.0 base score of 1.8; no public exploit code exists and no CISA KEV listing has been identified at time of analysis.
Technical ContextAI
Intel Slim Bootloader is an open-source, modular firmware bootloader developed by Intel, primarily targeting IoT and embedded computing platforms as a lightweight alternative to full UEFI implementations. CWE-787 (Out-of-Bounds Write) describes a memory safety defect in which firmware code writes data past the intended buffer boundary, potentially corrupting adjacent memory structures. In a bootloader context, such corruption during initialization or runtime phases can disrupt the boot sequencing process and render the system temporarily or persistently unavailable. The CVSS 4.0 vector confirms local-only attack vector (AV:L), high-privilege requirement (PR:H), specific attack requirements beyond privilege level (AT:P), and impact limited to low availability on the vulnerable system (VA:L) with no subsequent-system effects (SC:N/SI:N/SA:N). Note: the CPE string in the provided intelligence data is malformed, embedding the full vulnerability description text rather than a standard product identifier; specific affected version ranges must be sourced directly from Intel advisory INTEL-SA-01475.
RemediationAI
Apply the firmware update provided by Intel through advisory INTEL-SA-01475 at https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01475.html; the exact patched build number is not independently confirmed from available intelligence and must be obtained directly from the advisory. As a compensating control where firmware update deployment is operationally constrained - for example, in production embedded systems requiring scheduled maintenance windows - restricting physical and privileged OS-level access to affected devices substantially limits the exploitable attack surface, since exploitation requires both local access and a high-privilege account (PR:H). No network-based workarounds are necessary given the strictly local attack vector. Firmware updates in embedded environments typically require downtime and should be validated in a staging environment before production deployment; the trade-off of compensating controls is that the underlying memory corruption defect remains present until the firmware is patched.
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today