{"api_version":"1","generated_at":"2026-04-22T22:49:12+00:00","cve":"CVE-2018-8970","urls":{"html":"https://cve.report/CVE-2018-8970","api":"https://cve.report/api/cve/CVE-2018-8970.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2018-8970","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-8970"},"summary":{"title":"CVE-2018-8970","description":"The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2018-03-24 21:29:00","updated_at":"2018-04-24 16:40:00"},"problem_types":["CWE-295"],"metrics":[],"references":[{"url":"https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42","name":"https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Call strlen() if name length provided is 0, like OpenSSL does. · libressl-portable/openbsd@0654414 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt","name":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt","refsource":"MISC","tags":["Vendor Advisory"],"title":"","mime":"text/plain","httpstatus":"200","archivestatus":"200"},{"url":"https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff","name":"https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff","refsource":"MISC","tags":["Third Party Advisory"],"title":"e759a9cd84198613199259dbed401f4951747cff - boringssl - Git at Google","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-8970","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-8970","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2018","cve_id":"8970","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"openbsd","cpe5":"libressl","cpe6":"2.7.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"8970","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"openbsd","cpe5":"libressl","cpe6":"2.7.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2018-8970","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42","refsource":"MISC","url":"https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42"},{"name":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt","refsource":"MISC","url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt"},{"name":"https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff","refsource":"MISC","url":"https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff"}]}},"nvd":{"publishedDate":"2018-03-24 21:29:00","lastModifiedDate":"2018-04-24 16:40:00","problem_types":["CWE-295"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH"},"exploitabilityScore":2.2,"impactScore":5.2},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":5.8},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":4.9,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:openbsd:libressl:2.7.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2018","CveId":"8970","Ordinal":"125354","Title":"CVE-2018-8970","CVE":"CVE-2018-8970","Year":"2018"},"notes":[{"CveYear":"2018","CveId":"8970","Ordinal":"1","NoteData":"The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.","Type":"Description","Title":null},{"CveYear":"2018","CveId":"8970","Ordinal":"2","NoteData":"2018-03-24","Type":"Other","Title":"Published"},{"CveYear":"2018","CveId":"8970","Ordinal":"3","NoteData":"2018-03-24","Type":"Other","Title":"Modified"}]}}}