{"id":"CVE-2025-54503","kind":"vulnerability","aliases":["CVE-2025-54503"],"related":[],"title":"AMD SEV firmware: overlapping memory ranges let a privileged attacker corrupt integrity","description":"Improper handling of overlap between protected memory ranges in the Secure Encrypted Virtualization (SEV) firmware could allow a privileged attacker to cause misconfigurations in the RMP potentially resulting in loss of integrity.","summary":"AMD's Secure Encrypted Virtualization (SEV) firmware mishandles overlapping protected memory ranges, so a privileged attacker can misconfigure the RMP (Reverse Map Table). The sources say this can lead to loss of integrity.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["amd","confidential-computing","hypervisor","infrastructure","sev"],"not_affected_if":["no-sev","non-amd"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T22:17:46+00:00","first_seen_at":"2026-11-10T22:27:22+00:00","triaged_at":"2026-11-10T22:30:36+00:00","updated_at":"2026-11-10T22:30:36+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T22:30:36Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"AMD SEV firmware: overlapping memory ranges let a privileged attacker corrupt integrity","impact":"medium","summary":"AMD's Secure Encrypted Virtualization (SEV) firmware mishandles overlapping protected memory ranges, so a privileged attacker can misconfigure the RMP (Reverse Map Table). The sources say this can lead to loss of integrity.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["amd","sev","confidential-computing","hypervisor"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"privileged attacker corrupts memory protection, losing integrity of guest data","analyst_note":"Find AMD's security bulletin for CVE-2025-54503 to get affected and fixed firmware versions and the check method.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-sev","non-amd"],"who_is_affected":"Hosts running AMD EPYC processors with SEV or SEV-SNP enabled for confidential virtual machines are the exposed systems. The sources do not say which firmware versions are affected. Systems without SEV-enabled virtualization are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000697,"input_tokens":4535,"output_tokens":487,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2025':14A,17A '-54503':15A,18A 'allow':75C 'amd':1A,19B,26B 'attack':10A,41B,78C 'caus':80C 'comput':22B 'confidenti':21B 'confidential-comput':20B 'corrupt':11A 'could':74C 'cve':13A,16A 'encrypt':29B,70C 'firmwar':3A,32B,73C 'handl':60C 'hypervisor':23B 'improp':59C 'infrastructur':24B 'integr':12A,58B,90C 'lead':54B 'let':7A 'loss':56B,88C 'map':47B 'memori':5A,36B,65C 'misconfigur':43B,81C 'mishandl':33B 'overlap':4A,34B,62C 'potenti':85C 'privileg':9A,40B,77C 'protect':35B,64C 'rang':6A,37B,66C 'result':86C 'revers':46B 'rmp':45B,84C 'say':51B 'secur':28B,69C 'sev':2A,25B,31B,72C 'sourc':50B 'tabl':48B 'virtual':30B,71C","nicknames":[],"mitigations":[],"who_affected":"Hosts running AMD EPYC processors with SEV or SEV-SNP enabled for confidential virtual machines are the exposed systems. The sources do not say which firmware versions are affected. Systems without SEV-enabled virtualization are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["amd","confidentialcomputing","hypervisor","infrastructure","medium","sev"],"campaign_type":null,"search_a":"'-2025':14A,17A '-54503':15A,18A 'amd':1A 'attack':10A 'corrupt':11A 'cve':13A,16A 'firmwar':3A 'integr':12A 'let':7A 'memori':5A 'overlap':4A 'privileg':9A 'rang':6A 'sev':2A","search_b":"'amd':19B,26B 'attack':41B 'comput':22B 'confidenti':21B 'confidential-comput':20B 'encrypt':29B 'firmwar':32B 'hypervisor':23B 'infrastructur':24B 'integr':58B 'lead':54B 'loss':56B 'map':47B 'memori':36B 'misconfigur':43B 'mishandl':33B 'overlap':34B 'privileg':40B 'protect':35B 'rang':37B 'revers':46B 'rmp':45B 'say':51B 'secur':28B 'sev':25B,31B 'sourc':50B 'tabl':48B 'virtual':30B","search_c":"'allow':75C 'attack':78C 'caus':80C 'could':74C 'encrypt':70C 'firmwar':73C 'handl':60C 'improp':59C 'integr':90C 'loss':88C 'memori':65C 'misconfigur':81C 'overlap':62C 'potenti':85C 'privileg':77C 'protect':64C 'rang':66C 'result':86C 'rmp':84C 'secur':69C 'sev':72C 'virtual':71C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T22:17:46+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/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","cvss_by":"psirt@amd.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2025-54503","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54503","severity":null,"published_at":"2026-11-10T22:17:46+00:00","modified_at":"2026-11-10T22:17:46+00:00","first_seen_at":"2026-11-10T22:27:22+00:00","fetched_at":"2026-11-10T22:27:22+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}