# CVE-2023-20577

## Summary

- **CVE ID:** CVE-2023-20577
- **Severity:** HIGH
- **CVSS Score:** 7.4 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-121
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 4, 2026

## 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.

## Affected Products

- AMD — 2nd Gen AMD EPYC™ Processors (RomePI 1.0.0.H)
- AMD — 3rd Gen AMD EPYC™ Processors (MilanPI 1.0.0.C)
- AMD — 4th Gen AMD EPYC™ Processors (GenoaPI 1.0.0.8)
- AMD — AMD Instinct™ MI300A (MI300 SR5 PI 1.0.0.1)
- AMD — AMD Ryzen™ 3000 Series Desktop Processors (ComboAM4v2 1.2.0.B)
- AMD — AMD Ryzen™ 3000 Series Desktop Processors (ComboAM4 1.0.0.B)
- AMD — AMD Ryzen™ 5000 Series Desktop Processors (ComboAM4v2 1.2.0.B)
- AMD — AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics (ComboAM4v2 1.2.0.B)
- AMD — AMD Ryzen™ 7000 Series Processors (ComboAM5 1.0.0.7b)
- AMD — AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics (ComboAM4v2 1.2.0.B)
- AMD — AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics (ComboAM4 1.0.0.B)
- AMD — AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics (ComboAM4v2 1.2.0.B)
- AMD — AMD Ryzen™ Threadripper™ 3000 Series Processors (CastlePeakPI-SP3r3 1.0.0.A)
- AMD — AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors (ChagallWSPI-sWRX8 1.0.0.7)
- AMD — AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors (CastlePeakWSPI-sWRX8 1.0.0.C)
- AMD — AMD Ryzen™ Threadripper™ PRO 5000WX Processors (ChagallWSPI-sWRX8 1.0.0.7)
- AMD — AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics (PicassoPI-FP5 1.0.1.0)
- AMD — AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics (PollockPI-FT5 1.0.0.6)
- AMD — AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics (PicassoPI-FP5 1.0.1.0)
- AMD — AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics (RenoirPI-FP6 1.0.0.D)
- AMD — AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics (CezannePI-FP6 1.0.0.F)
- AMD — AMD Ryzen™ 7020 Series Processors with Radeon™ Graphics (MendocinoPI-FT6 1.0.0.6)
- AMD — AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics (RembrandtPI-FP7 1.0.0.9b)
- AMD — AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics (RembrandtPI-FP7 1.0.0.9b)
- AMD — AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics (CezannePI-FP6 1.0.0.F)
- AMD — AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics (CezannePI-FP6 1.0.0.F)
- AMD — AMD Ryzen™ 7040 Series Processors with Radeon™ Graphics (PhoenixPI-FP8-FP7 1.0.0.2)
- AMD — AMD Ryzen™ 7045 Series Mobile Processors (DragonRangeFL1PI 1.0.0.3a)
- AMD — AMD EPYC™ Embedded 3000 (Snowyowl PI 1.1.0.B)
- AMD — AMD EPYC™ Embedded 7002 (EmbRomePI-SP3 1.0.0.B)
- AMD — AMD EPYC™ Embedded 7003 (EmbMilanPI-SP3 1.0.0.8)
- AMD — AMD EPYC™ Embedded 9003 (EmbGenoaPI-SP5 1.0.0.3)
- AMD — AMD Ryzen™ Embedded R1000 (EmbeddedPI-FP5 1.2.0.A)
- AMD — AMD Ryzen™ Embedded R2000 (EmbeddedPI-FP5 1.0.0.2)
- AMD — AMD Ryzen™ Embedded 5000 (EmbAM4PI 1.0.0.4)
- AMD — AMD Ryzen™ Embedded V1000 (EmbeddedPI-FP5 1.2.0.A)
- AMD — AMD Ryzen™ Embedded V2000 (EmbeddedPI-FP6 1.0.0.9)
- AMD — AMD Ryzen™ Embedded V3000 (EmbeddedPI-FP7r2 1.0.0.8)

## References

- [CNA](https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7009.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._