{"cve":"CVE-2023-20521","nvd":{"published":"2023-11-14T19:15:15.580","modified":"2026-06-17T05:30:15.167","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H","score":5.7},"cwes":["CWE-367"],"references":["https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3002","https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4002","https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-5001","https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3002","https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4002"],"products":["amd:amd_3015ce_firmware","amd:amd_3015e_firmware","amd:athlon_gold_3150g_firmware","amd:athlon_gold_pro_3150g_firmware","amd:athlon_gold_pro_3150ge_firmware","amd:athlon_pro_300ge_firmware","amd:epyc_7001_firmware","amd:epyc_7203_firmware","amd:epyc_7203p_firmware","amd:epyc_7232p_firmware","amd:epyc_7251_firmware","amd:epyc_7252_firmware","amd:epyc_7261_firmware","amd:epyc_7262_firmware","amd:epyc_7272_firmware","amd:epyc_7281_firmware","amd:epyc_7282_firmware","amd:epyc_72f3_firmware","amd:epyc_7301_firmware","amd:epyc_7302_firmware","amd:epyc_7302p_firmware","amd:epyc_7303_firmware","amd:epyc_7303p_firmware","amd:epyc_7313_firmware","amd:epyc_7313p_firmware","amd:epyc_7343_firmware","amd:epyc_7351_firmware","amd:epyc_7351p_firmware","amd:epyc_7352_firmware","amd:epyc_7371_firmware","amd:epyc_7373x_firmware","amd:epyc_73f3_firmware","amd:epyc_7401_firmware","amd:epyc_7401p_firmware","amd:epyc_7402_firmware","amd:epyc_7402p_firmware","amd:epyc_7413_firmware","amd:epyc_7443_firmware","amd:epyc_7443p_firmware","amd:epyc_7451_firmware","amd:epyc_7452_firmware","amd:epyc_7453_firmware","amd:epyc_7473x_firmware","amd:epyc_74f3_firmware","amd:epyc_7501_firmware","amd:epyc_7502_firmware","amd:epyc_7502p_firmware","amd:epyc_7513_firmware","amd:epyc_7532_firmware","amd:epyc_7542_firmware"],"source":"nvd","synced_at":"2026-10-19T21:42:07.670898610+00:00"},"epss":{"cve":"CVE-2023-20521","score":0.00263,"percentile":0.18155,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}