CVE-2021-26356
HIGH
7.4
CVSS Score
Published: May 9, 2023 at 06:58 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
202 products affected across 1 vendorEpyc 7713P FirmwareEpyc 7663 FirmwareEpyc 7413 Firmware
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Severity
HIGH7.4
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
A TOCTOU in ASP bootloader may allow an attacker to tamper with the SPI ROM following data read to memory potentially resulting in S3 data corruption and information disclosure.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < naplespi_1.0.0.h
Affected range stops below naplespi_1.0.0.h, so it looks safe — our inference, not a vendor statement
amd-epyc-7001 (same device)
v < romepi_1.0.0.d
Affected range stops below romepi_1.0.0.d, so it looks safe — our inference, not a vendor statement
amd-epyc-7002 (same device)
v < romepi_1.0.0.d
Affected range stops below romepi_1.0.0.d, so it looks safe — our inference, not a vendor statement
amd-epyc-7232p (same device)
v < naplespi_1.0.0.h
Affected range stops below naplespi_1.0.0.h, so it looks safe — our inference, not a vendor statement
amd-epyc-7251 (same device)
v < romepi_1.0.0.d
Affected range stops below romepi_1.0.0.d, so it looks safe — our inference, not a vendor statement
amd-epyc-7252 (same device)
v < naplespi_1.0.0.h
Affected range stops below naplespi_1.0.0.h, so it looks safe — our inference, not a vendor statement
amd-epyc-7261 (same device)
v < romepi_1.0.0.d
Affected range stops below romepi_1.0.0.d, so it looks safe — our inference, not a vendor statement
amd-epyc-7262 (same device)
v < romepi_1.0.0.d
Affected range stops below romepi_1.0.0.d, so it looks safe — our inference, not a vendor statement
amd-epyc-7272 (same device)
v < naplespi_1.0.0.h
Affected range stops below naplespi_1.0.0.h, so it looks safe — our inference, not a vendor statement
amd-epyc-7281 (same device)
v < romepi_1.0.0.d
Affected range stops below romepi_1.0.0.d, so it looks safe — our inference, not a vendor statement
amd-epyc-7282 (same device)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
Vendor Advisory
Source: [email protected]
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001Vendor Advisory
Source: [email protected]
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.4HIGHCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-367
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