CVE-2021-46755: AMD Ryzen 3100 Firmware

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious bootloader to exhaust the SysHub resources resulting in a potential denial of service.

Affected products

  • AMD Ryzen 3100 Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3300x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3500 Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3500x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3600 Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3600x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3600xt Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3800x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3800xt Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3900 Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3900x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3900xt Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 3950x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4pi_1.0.0.9 only
  • AMD Ryzen 5500 Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5600 Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5600g Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5600x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5700g Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5700x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5800x3d Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5800x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5900x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only
  • AMD Ryzen 5950x Firmware: version comboam4_v2_pi_1.2.0.8 only; version comboam4v2_pi_1.2.0.6 only

Published 2023-05-09. Last modified 2026-06-17.