Local service interruption via SMM binary parsing
Published Jan 10, 2023 · Updated Apr 9, 2025
Out-of-bounds write in 3rd Gen AMD EPYC Processors allows local users to interrupt service through a crafted SMM binary. The SMM binary parser fails to validate bounds on attacker-controlled data, allowing writes outside the intended DRTM user-application memory region. Exploitation requires low-privileged local access; the documented result is denial of availability, without reported data disclosure or integrity loss.
Summary
What happened
Out-of-bounds write in 3rd Gen AMD EPYC Processors allows local users to interrupt service through a crafted SMM binary. The SMM binary parser fails to validate bounds on attacker-controlled data, allowing writes outside the intended DRTM user-application memory region. Exploitation requires low-privileged local access; the documented result is denial of availability, without reported data disclosure or integrity loss.
The record
- CVE
- CVE-2021-46791
- Published
- Jan 10, 2023
- Updated
- Apr 9, 2025
- Vendor
- Advanced Micro Devices, Inc.
- Product
- 3rd Gen AMD EPYC Processors
- Classifications
- CWE-787, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 10, 2023CVE publishedPublication date reported by the CVE source.
- Apr 9, 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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