Denial of service via SMI checksum over-read
Published May 9, 2023 · Updated Jan 28, 2025
Out-of-bounds read in AMD Secure Processor firmware on affected Ryzen and Athlon processors allows remote attackers to interrupt service. The SMI mailbox checksum calculation reads beyond its intended bounds, causing the secure processor to raise a data abort. AMD does not disclose how remote attackers reach the firmware mailbox; the reported consequence is limited to availability.
Summary
What happened
Out-of-bounds read in AMD Secure Processor firmware on affected Ryzen and Athlon processors allows remote attackers to interrupt service. The SMI mailbox checksum calculation reads beyond its intended bounds, causing the secure processor to raise a data abort. AMD does not disclose how remote attackers reach the firmware mailbox; the reported consequence is limited to availability.
The record
- CVE
- CVE-2021-46794
- Published
- May 9, 2023
- Updated
- Jan 28, 2025
- Vendor
- AMD
- Product
- AMD Ryzen 3000 Series Mobile Processors with Radeon Graphics (Picasso)
- Classifications
- CWE-125, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 9, 2023CVE publishedPublication date reported by the CVE source.
- Jan 28, 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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