Home/CVE/TOCTOU in the ASP Bootloader may allow an attacker with physical access to tamper with SPI ROM records after memory cont
CVE

CVE-2023-20521

TOCTOU in the ASP Bootloader may allow an attacker with physical access to tamper with SPI ROM records after memory cont

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.

LOW · CVSS 3.3 EPSS 0.00056
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0

Weakness Classification

Affected Products & Versions

60
amd epyc 7001 firmware< naplespi_1.0.0.h
amd epyc 7251 firmware< naplespi_1.0.0.h
amd epyc 7261 firmware< naplespi_1.0.0.h
amd epyc 7281 firmware< naplespi_1.0.0.h
amd epyc 7301 firmware< naplespi_1.0.0.h
amd epyc 7351 firmware< naplespi_1.0.0.h
amd epyc 7351p firmware< naplespi_1.0.0.h
amd epyc 7371 firmware< naplespi_1.0.0.h

Scoring & Timeline

3.3
LOW · CVSS v3.1 · psirt@amd.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Nov 2023 · 07:15 PM
CVSS VectorCVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.

Vendor Advisories

6
suse-csafSUSE-SU-2024:2376-1
suse-csafSUSE-SU-2023:4654-1
suse-csafSUSE-SU-2023:4655-1
suse-csafSUSE-SU-2023:4660-1
suse-csafSUSE-SU-2023:4664-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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