CVE intelligence and bounded remediation

CVE-2021-46755 — Amd Ryzen 5500 Firmware security vulnerability

High CVSS 7.5

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.

Severity
High
CVSS
7.5 (3.1)
Published
2023-05-09
CISA KEV
Not currently listed
Ecosystem
operating-system

Affected products

  • amd / ryzen_5500_firmware / comboam4_v2_pi_1.2.0.8
  • amd / ryzen_5500_firmware / comboam4v2_pi_1.2.0.6
  • amd / ryzen_5600_firmware / comboam4_v2_pi_1.2.0.8
  • amd / ryzen_5600_firmware / comboam4v2_pi_1.2.0.6
  • amd / ryzen_5600g_firmware / comboam4_v2_pi_1.2.0.8
  • amd / ryzen_5600g_firmware / comboam4v2_pi_1.2.0.6

Showing 6 representative product identities from 46 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

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