Denial of service via unvalidated bootloader syscall
Published Jan 10, 2023 · Updated Apr 7, 2025
Improper input validation in the ASP Bootloader on AMD EPYC 7001, 7002, and 7003 processors allows remote authenticated users to interrupt service. The bootloader accepts a privileged syscall input without adequate validation and uses it to read beyond the intended memory bounds. Reaching the flaw requires privileged access; the documented consequence is denial of service, with no published integrity or confidentiality impact.
Summary
What happened
Improper input validation in the ASP Bootloader on AMD EPYC 7001, 7002, and 7003 processors allows remote authenticated users to interrupt service. The bootloader accepts a privileged syscall input without adequate validation and uses it to read beyond the intended memory bounds. Reaching the flaw requires privileged access; the documented consequence is denial of service, with no published integrity or confidentiality impact.
The record
- CVE
- CVE-2023-20527
- Published
- Jan 10, 2023
- Updated
- Apr 7, 2025
- Vendor
- AMD
- Product
- AMD EPYC 7002 Series Processors
- Classifications
- CWE-20, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 10, 2023CVE publishedPublication date reported by the CVE source.
- Apr 7, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=various
What conditions does exploitation require?
What is affected?
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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