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

CVE record · `CVE-2023-20559`

- **Identifiers:** `CVE-2023-20559`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** AMD
- **Weakness (CWE):** [CWE-691](https://cwe.mitre.org/data/definitions/691.html)
- **Tags:** [CWE-691](https://agentprime.io/advisories/tag/cwe-691.md)
- **Technologies:** [AMD Ryzen™ 2000 Series](https://agentprime.io/advisories/technology/amd-ryzentm-2000-series.md) · [AMD Ryzen™ 3000 Series](https://agentprime.io/advisories/technology/amd-ryzentm-3000-series.md) · [AMD Ryzen™ 4000 Series](https://agentprime.io/advisories/technology/amd-ryzentm-4000-series.md) · [AMD Ryzen™ 5000 Series](https://agentprime.io/advisories/technology/amd-ryzentm-5000-series.md) · [2nd Gen AMD Ryzen™ Threadripper™ Processor](https://agentprime.io/advisories/technology/2nd-gen-amd-ryzentm-threadrippertm-processor.md) · [3rd Gen AMD Ryzen™ Threadripper™ Processors](https://agentprime.io/advisories/technology/3rd-gen-amd-ryzentm-threadrippertm-processors.md) · [AMD Ryzen™ Threadripper™ PRO Processor](https://agentprime.io/advisories/technology/amd-ryzentm-threadrippertm-pro-processor.md)
- **Published:** 23 Mar 2023
- **Updated:** 25 Feb 2025
- **Reviewed by a person:** No

Published by the CVE Program (CNA: AMD) at 23 Mar 2023, 18:49 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: AMD. Product: Ryzen™ 2000 Series.
  - affected: `various`
  - Other versions: unaffected
- Vendor: AMD. Product: Ryzen™ 3000 Series.
  - affected: `various`
  - Other versions: unaffected
- Vendor: AMD. Product: Ryzen™ 4000 Series.
  - affected: `various`
  - Other versions: unaffected
- Vendor: AMD. Product: Ryzen™ 5000 Series.
  - affected: `various`
  - Other versions: unaffected
- Vendor: AMD. Product: 2nd Gen AMD Ryzen™ Threadripper™ Processor.
  - affected: `Various`
  - Other versions: unaffected
- Vendor: AMD. Product: 3rd Gen AMD Ryzen™ Threadripper™ Processors.
  - affected: `various`
  - Other versions: unaffected
- Vendor: AMD. Product: Ryzen™ Threadripper™ PRO Processor.
  - affected: `various`
  - Other versions: unaffected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from ADP (CISA-ADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0067, the 52nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 23 Mar 2023. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2023-20559](https://www.cve.org/CVERecord?id=CVE-2023-20559)
- [NVD: CVE-2023-20559](https://nvd.nist.gov/vuln/detail/CVE-2023-20559)

### References from the CNA

- <https://www.amd.com/en/resources/product-security/bulletin/amd-sb-1027.html> (vendor-advisory)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2023-20559>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2023-20559/>. Everything for agents: <https://agentprime.io/llms.txt>.