CVE-2023-20521

MEDIUM
5.7
CVSS Score
Published: November 14, 2023 at 06:52 PM UTC
Updated: June 17, 2026 at 05:30 AM UTC
197 products affected across 1 vendorEpyc 7663 FirmwareEpyc 7713P FirmwareEpyc 7413 Firmware

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Severity
MEDIUM5.7
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

TOCTOU in the ASP Bootloader may allow an attacker with physical access to tamper with SPI ROM records after memory content verification, potentially leading to loss of confidentiality or a denial of service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < pollockpi-ft5_1.0.0.4
Affected range stops below pollockpi-ft5_1.0.0.4, so it looks safe — our inference, not a vendor statement
amd-amd-3015ce (same device)
v < pollockpi-ft5_1.0.0.4
Affected range stops below pollockpi-ft5_1.0.0.4, so it looks safe — our inference, not a vendor statement
amd-amd-3015e (same device)
All versions
amd-athlon-gold-3150g (same device)
All versions
amd-athlon-gold-pro-3150g (same device)
All versions
amd-athlon-gold-pro-3150ge (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-7001 (same device)
v < milanpi_1.0.0.7
Affected range stops below milanpi_1.0.0.7, so it looks safe — our inference, not a vendor statement
amd-epyc-7203 (same device)
v < milanpi_1.0.0.7
Affected range stops below milanpi_1.0.0.7, so it looks safe — our inference, not a vendor statement
amd-epyc-7203p (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)

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
PHYSICAL
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-367

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