{"id":"CVE-2023-20540","aliases":["EUVD-2023-60597","GHSA-q66m-cmxr-cpcf"],"status":"published","title":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute...","description":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.","severity":{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00153,"percentile":0.04518,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-208"],"published":"2026-06-26T15:44:59Z","modified":"2026-06-26T20:04:17Z","products":[{"vendor":"amd","product":"amd ryzen™ 3000 series desktop processors"},{"vendor":"amd","product":"amd ryzen™ 5000 series desktop processors"},{"vendor":"amd","product":"amd ryzen™ threadripper™ 3000 series processors"},{"vendor":"amd","product":"amd ryzen™ threadripper™ pro 3000wx series processors"},{"vendor":"amd","product":"amd ryzen™ threadripper™ pro 5000 wx-series processors"}],"references":[{"url":"https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4012.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-20540"},{"url":"https://github.com/advisories/GHSA-q66m-cmxr-cpcf"}],"sources":{"cve":[{"id":"CVE-2023-20540","description":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.","status":"published","published":"2026-06-26T15:44:59.841Z","modified":"2026-06-26T16:00:59.349Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:35:13.368958Z"}],"euvd":[{"id":"EUVD-2023-60597","description":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.","status":"published","published":"2026-06-26T15:44:59Z","modified":"2026-06-26T16:00:59Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T18:20:24.495602Z"}],"ghsa":[{"id":"GHSA-q66m-cmxr-cpcf","title":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute...","description":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.","status":"published","published":"2026-06-26T18:33:58Z","modified":"2026-06-26T18:34:06Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:09:01.878033Z"}],"nvd":[{"id":"CVE-2023-20540","description":"An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.","status":"published","published":"2026-06-26T16:16:28.81Z","modified":"2026-06-26T20:04:17.603Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:09:27.733183Z"}]}}