{"id":"CVE-2025-0027","kind":"vulnerability","aliases":["CVE-2025-0027"],"related":[],"title":"AMD SEV firmware: hypervisor can bypass RMP and alter confidential VM memory","description":"Improper access control in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to bypass Reverse Map Table (RMP) protections, potentially impacting the integrity of Secure Encrypted Virtualization-Secure Nested Paging (SEV-SNP) guest memory.","summary":"AMD SEV firmware has an access control flaw that lets a malicious hypervisor bypass Reverse Map Table protections. This can compromise the integrity of SEV-SNP guest memory.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["amd","confidential-computing","hypervisor","infrastructure","sev-snp"],"not_affected_if":["intel-hardware","no-sev-snp-guests"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T22:17:44+00:00","first_seen_at":"2026-11-10T22:27:22+00:00","triaged_at":"2026-11-10T22:30:39+00:00","updated_at":"2026-11-10T22:30:39+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T22:30:39Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"AMD SEV firmware: hypervisor can bypass RMP and alter confidential VM memory","impact":"medium","summary":"AMD SEV firmware has an access control flaw that lets a malicious hypervisor bypass Reverse Map Table protections. This can compromise the integrity of SEV-SNP guest memory.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["amd","sev-snp","confidential-computing","hypervisor"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"malicious hypervisor alters SEV-SNP guest memory integrity","analyst_note":"Find AMD's security bulletin for CVE-2025-0027 to get affected firmware families and fixed versions.","how_to_check":"unknown","plain_action":"","product_name":"AMD SEV firmware","needs_analyst":true,"not_affected_if":["no-sev-snp-guests","intel-hardware"],"who_is_affected":"Systems running AMD EPYC processors with SEV-SNP confidential virtual machines, where the hypervisor is not fully trusted. Teams that do not run SEV-SNP guests are not exposed through this flaw. The sources do not name affected firmware versions.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000709,"input_tokens":4570,"output_tokens":504,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-0027':15A,18A '-2025':14A,17A 'access':33B,58C 'allow':68C 'alter':9A 'amd':1A,19B,28B,61C 'bypass':6A,41B,73C 'compromis':48B 'comput':22B 'confidenti':10A,21B 'confidential-comput':20B 'control':34B,59C 'could':67C 'cve':13A,16A 'encrypt':63C,85C 'firmwar':3A,30B,66C 'flaw':35B 'guest':55B,94C 'hypervisor':4A,23B,40B,71C 'impact':80C 'improp':57C 'infrastructur':24B 'integr':50B,82C 'let':37B 'malici':39B,70C 'map':43B,75C 'memori':12A,56B,95C 'nest':89C 'page':90C 'potenti':79C 'protect':45B,78C 'revers':42B,74C 'rmp':7A,77C 'secur':62C,84C,88C 'sev':2A,26B,29B,53B,65C,92C 'sev-snp':25B,52B,91C 'snp':27B,54B,93C 'tabl':44B,76C 'virtual':64C,87C 'virtualization-secur':86C 'vm':11A","nicknames":[],"mitigations":[],"who_affected":"Systems running AMD EPYC processors with SEV-SNP confidential virtual machines, where the hypervisor is not fully trusted. Teams that do not run SEV-SNP guests are not exposed through this flaw. The sources do not name affected firmware versions.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["amd","confidentialcomputing","hypervisor","infrastructure","medium","sevsnp"],"campaign_type":null,"search_a":"'-0027':15A,18A '-2025':14A,17A 'alter':9A 'amd':1A 'bypass':6A 'confidenti':10A 'cve':13A,16A 'firmwar':3A 'hypervisor':4A 'memori':12A 'rmp':7A 'sev':2A 'vm':11A","search_b":"'access':33B 'amd':19B,28B 'bypass':41B 'compromis':48B 'comput':22B 'confidenti':21B 'confidential-comput':20B 'control':34B 'firmwar':30B 'flaw':35B 'guest':55B 'hypervisor':23B,40B 'infrastructur':24B 'integr':50B 'let':37B 'malici':39B 'map':43B 'memori':56B 'protect':45B 'revers':42B 'sev':26B,29B,53B 'sev-snp':25B,52B 'snp':27B,54B 'tabl':44B","search_c":"'access':58C 'allow':68C 'amd':61C 'bypass':73C 'control':59C 'could':67C 'encrypt':63C,85C 'firmwar':66C 'guest':94C 'hypervisor':71C 'impact':80C 'improp':57C 'integr':82C 'malici':70C 'map':75C 'memori':95C 'nest':89C 'page':90C 'potenti':79C 'protect':78C 'revers':74C 'rmp':77C 'secur':62C,84C,88C 'sev':65C,92C 'sev-snp':91C 'snp':93C 'tabl':76C 'virtual':64C,87C 'virtualization-secur':86C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T22:17:44+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-2025-0027","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-0027","severity":null,"published_at":"2026-11-10T22:17:44+00:00","modified_at":"2026-11-10T22:17:44+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"}