Vulnerability Database

327,210

Total vulnerabilities in the database

CVE-2021-46755

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.

  • Published: May 9, 2023
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-46755
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

No CWE or OWASP classifications available.

Software From Fixed in
amd / ryzen_5500_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5500_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5600_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5600_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5600g_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5600g_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5600x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5600x_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5700g_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5700g_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5700x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5700x_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5800x3d_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5800x3d_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5800x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5800x_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5900x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5900x_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_5950x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_5950x_firmware comboam4v2_pi_1.2.0.6 comboam4v2_pi_1.2.0.6.x
amd / ryzen_3100_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3100_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3300x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3300x_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3500_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3500_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3500x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3500x_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3600_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3600_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3600x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3600x_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3600xt_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3600xt_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3800x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3800x_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3800xt_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3800xt_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3900_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3900_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3900x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3900x_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3900xt_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3900xt_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x
amd / ryzen_3950x_firmware comboam4_v2_pi_1.2.0.8 comboam4_v2_pi_1.2.0.8.x
amd / ryzen_3950x_firmware comboam4pi_1.0.0.9 comboam4pi_1.0.0.9.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.