# Improper Prevention of Lock Bit Modification in SEV firmware could allow a privileged attacker to downgrade firmware potentially resulting in a loss of integrity.

CVE record · `CVE-2025-52536`

- **Identifiers:** `CVE-2025-52536`
- **State:** Confirmed
- **Severity:** CVSS 6.7 Medium
- **Critical:** No
- **CNA:** AMD
- **Weakness (CWE):** [CWE-1231](https://cwe.mitre.org/data/definitions/1231.html)
- **Tags:** [CWE-1231](https://agentprime.io/advisories/tag/cwe-1231.md)
- **Technologies:** [AMD EPYC™ 9004 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-9004-series-processors.md) · [AMD EPYC™ 7003 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-7003-series-processors.md) · [AMD EPYC™ 9005 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-9005-series-processors.md) · [AMD EPYC™ 8004 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-8004-series-processors.md) · [AMD EPYC™ Embedded 7003 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-embedded-7003-series-processors.md) · [AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa")](https://agentprime.io/advisories/technology/amd-epyctm-embedded-9004-series-processors-formerly-codenamed-genoa.md) · [AMD EPYC™ Embedded 9005 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-embedded-9005-series-processors.md) · [AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo")](https://agentprime.io/advisories/technology/amd-epyctm-embedded-9004-series-processors-formerly-codenamed-bergamo.md) · [AMD EPYC™ Embedded 8004 Series Processors](https://agentprime.io/advisories/technology/amd-epyctm-embedded-8004-series-processors.md)
- **Published:** 10 Feb 2026
- **Updated:** 10 Feb 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: AMD) at 10 Feb 2026, 19:09 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: AMD EPYC™ 9004 Series Processors.
  - unaffected: `GenoaPI 1.0.0.G`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ 7003 Series Processors.
  - unaffected: `MilanPI 1.0.0.H`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ 9005 Series Processors.
  - unaffected: `TurinPI 1.0.0.5`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ 8004 Series Processors.
  - unaffected: `GenoaPI 1.0.0.G`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ Embedded 7003 Series Processors.
  - unaffected: `EmbMilanPI-SP3 v9 1.0.0.C`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa").
  - unaffected: `EmbGenoaPI-SP5 1.0.0.B`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ Embedded 9005 Series Processors.
  - unaffected: `EmbTurinPI-SP5_1.0.0.1`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo").
  - unaffected: `EmbGenoaPI-SP5 1.0.0.B`
  - Other versions: affected
- Vendor: AMD. Product: AMD EPYC™ Embedded 8004 Series Processors.
  - unaffected: `EmbGenoaPI-SP5 1.0.0.B`
  - Other versions: affected

## 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

- 6.7 Medium, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`, from CNA (AMD)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0016, the 5th percentile, on 6 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 10 Feb 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2025-52536](https://www.cve.org/CVERecord?id=CVE-2025-52536)
- [NVD: CVE-2025-52536](https://nvd.nist.gov/vuln/detail/CVE-2025-52536)

### References from the CNA

- <https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3023.html>

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-2025-52536>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2025-52536/>. Everything for agents: <https://agentprime.io/llms.txt>.