Is CVE-2023-20521 in the CISA KEV catalog?

No. CVE-2023-20521 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-20521?

CVE-2023-20521 has a CVSS v3 base score of 3.3 (LOW).

What is the EPSS score for CVE-2023-20521?

CVE-2023-20521 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-20521?

Upgrade amd 3015ce firmware to pollockpi-ft5_1.0.0.4 or later. Fixes are available for 89 affected products.

CVE & CISA-KEV Catalog

CVE-2023-20521

LOW

3.3

CVSS v3

NVD

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.

CWE-367TOCTOU Race Condition

How to fix

Remediation Available

amd 3015ce firmwareNVD

Affected:< pollockpi-ft5_1.0.0.4Fixed in:pollockpi-ft5_1.0.0.4CVE-2023-20521derived from NVD

amd 3015e firmwareNVD

Affected:< pollockpi-ft5_1.0.0.4Fixed in:pollockpi-ft5_1.0.0.4CVE-2023-20521derived from NVD

epyc 7001 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7203 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7203p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7232p firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7251 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7252 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7261 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7262 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7272 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7281 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7282 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 72f3 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7301 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7302 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7302p firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7303 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7303p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7313 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7313p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7343 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7351 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7351p firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7352 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7371 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7373x firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 73f3 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7401 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7401p firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7402 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7402p firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7413 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7443 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7443p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7451 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7452 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7453 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7473x firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 74f3 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7501 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7502 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7502p firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7513 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7532 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7542 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7543 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7543p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7551 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7551p firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7552 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7573x firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 75f3 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7601 firmwareNVD

Affected:< naplespi_1.0.0.hFixed in:naplespi_1.0.0.hCVE-2023-20521derived from NVD

epyc 7642 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7643 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7643p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7662 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7663 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7663p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7702 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7702p firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7713 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7713p firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7742 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7763 firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7773x firmwareNVD

Affected:< milanpi_1.0.0.7Fixed in:milanpi_1.0.0.7CVE-2023-20521derived from NVD

epyc 7f32 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7f52 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7f72 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

epyc 7h12 firmwareNVD

Affected:< romepi_1.0.0.dFixed in:romepi_1.0.0.dCVE-2023-20521derived from NVD

ryzen 3 3200u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 3 3250c firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 3 3250u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 3 3300u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 3 3350u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 5 3450u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 5 3500c firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 5 3500u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 5 3550h firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 5 3580u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 7 3700c firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 7 3700u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 7 3750h firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen 7 3780u firmwareNVD

Affected:< picassopi-fp5_1.0.0.eFixed in:picassopi-fp5_1.0.0.eCVE-2023-20521derived from NVD

ryzen threadripper 2920x firmwareNVD

Affected:< summitpi-sp3r2_1.1.0.6Fixed in:summitpi-sp3r2_1.1.0.6CVE-2023-20521derived from NVD

ryzen threadripper 2950x firmwareNVD

Affected:< summitpi-sp3r2_1.1.0.6Fixed in:summitpi-sp3r2_1.1.0.6CVE-2023-20521derived from NVD

ryzen threadripper 2970wx firmwareNVD

Affected:< summitpi-sp3r2_1.1.0.6Fixed in:summitpi-sp3r2_1.1.0.6CVE-2023-20521derived from NVD

ryzen threadripper 2990wx firmwareNVD

Affected:< summitpi-sp3r2_1.1.0.6Fixed in:summitpi-sp3r2_1.1.0.6CVE-2023-20521derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:L

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Vendor Advisory2

Other references1

amd.com

Related Vulnerabilities

Other CWE-367 (TOCTOU Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-36980	High	8.1	83%	-	Fix
CVE-2024-30088	High	7.0	68%	KEV + Ransom	Fix
CVE-2004-0594	Medium	5.1	55%	-	Fix
CVE-2024-50379	Critical	9.8	44%	-	Fix
CVE-2023-38146	High	8.8	39%	-	Fix
CVE-2024-0132	Critical	9.0	37%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.