CVE-2023-20577

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Heap Overflow in AMD SMM Module

Publication date: 2026-09-02

Last updated on: 2026-09-04

Assigner: Advanced Micro Devices Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-02

Last Modified

2026-09-04

Generated

2026-09-16

AI Q&A

2026-09-02

EPSS Evaluated

2026-09-15

NVD

CVE-2023-20577

EUVD

EUVD-2023-60617

Affected Vendors & Products

Vendor	Product	Version / Range
amd	comboam4v2	1.2.0.b
amd	picassopi_fp5	1.0.1.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a heap overflow vulnerability in an SMM module. It may allow an attacker who already has access to write to SPI flash to execute arbitrary code. The vulnerability requires a second vulnerability to enable the SPI flash write capability.

Detection Guidance

Detection requires checking firmware versions against AMD's specified mitigations. For affected systems, verify if ComboAM4v2 firmware is at least 1.2.0.B or PicassoPI-FP5 firmware is at least 1.0.1.0. Use system management tools or BIOS/UEFI interfaces to inspect firmware versions.

Impact Analysis

An attacker could exploit this to execute arbitrary code on your system, potentially gaining full control. This could lead to data theft, system compromise, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR and HIPAA requirements for data protection and security. Compliance may be compromised if systems are not patched.

Mitigation Strategies

Apply security updates from AMD to patch the SMM module heap overflow. Ensure SPI flash write access is restricted to prevent exploitation of this vulnerability.

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