CVE-2021-26335

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

Improper input and range checking in the AMD Secure Processor (ASP) boot loader image header may allow an attacker to use attacker-controlled values prior to signature validation potentially resulting in arbitrary code execution.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
AMDRyzen™ Seriesvarious
AMDAthlon™ Seriesvarious

References

Timeline

Published
Nov 16, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-263365.5Insufficient bounds checking in System Management Unit (SMU) may cause invalid memory accesses/updates that could result in SMU hang and subCVE-2021-263375.5Insufficient DRAM address validation in System Management Unit (SMU) may result in a DMA read from invalid DRAM address to SRAM resulting inCVE-2021-263387.5Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM reCVE-2021-263395.5A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU core hang resulting iCVE-2021-263408.4A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation CVE-2021-263416.5Some AMD CPUs may transiently execute beyond unconditional direct branches, which may potentially result in data leakage.CVE-2021-263423.3In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includCVE-2021-263435.5Insufficient validation in ASP BIOS and DRTM commands may allow malicious supervisor x86 software to disclose the contents of sensitive memoCVE-2021-263448.2An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to modCVE-2021-263454.9Failure to validate the value in APCB may allow a privileged attacker to tamper with the APCB token to force an out-of-bounds memory read poCVE-2021-263465.5Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in tCVE-2021-263474.7Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in t
CVE-2021-26335: High severity, CVSS 7.8 | Vulnix