Arbitrary code execution via SMM heap overflow
Published Sep 2, 2026 · Updated Sep 4, 2026
Heap overflow in the SMM module of affected AMD processors allows local attackers to execute arbitrary code through crafted SPI flash data. AMD has not disclosed the affected function or the specific unsafe operation beyond identifying a heap overflow in the SMM module. Exploitation requires access to a second vulnerability that permits writes to SPI flash, and successful exploitation runs code in firmware context.
Summary
What happened
Heap overflow in the SMM module of affected AMD processors allows local attackers to execute arbitrary code through crafted SPI flash data. AMD has not disclosed the affected function or the specific unsafe operation beyond identifying a heap overflow in the SMM module. Exploitation requires access to a second vulnerability that permits writes to SPI flash, and successful exploitation runs code in firmware context.
The record
- CVE
- CVE-2023-20577
- Published
- Sep 2, 2026
- Updated
- Sep 4, 2026
- Vendor
- Advanced Micro Devices, Inc.
- Product
- AMD Ryzen™ Embedded V1000 Series Processors
- Classifications
- CWE-121, T1542.001
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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