{"id":"CVE-2018-8970","aliases":["EUVD-2018-20577","GHSA-7gr4-mrjx-cjx9","openSUSE-SU-2024:10985-1"],"status":"published","title":"The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2...","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.","severity":{"version":"3.0","score":7.4,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.0102,"percentile":0.63629,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-295"],"published":"2018-03-24T21:00:00Z","modified":"2026-10-24T14:20:20Z","exploits":[{"source":"pocgithub","id":"tiran/CVE-2018-8970","title":"tiran/CVE-2018-8970","date":"2018-03-25","url":"https://github.com/tiran/CVE-2018-8970"}],"affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"libressl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.4-1.2"}]}],"bundled":2}],"products":[{"vendor":"openbsd","product":"libressl"}],"references":[{"url":"https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-8970"},{"url":"https://github.com/advisories/GHSA-7gr4-mrjx-cjx9"},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12434","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-8970","tags":["web"]}],"sources":{"cve":[{"id":"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.","status":"published","published":"2018-03-24T21:00:00Z","modified":"2024-08-05T07:10:47.345Z","updated_at":"2026-11-02T14:35:04.540365Z"}],"euvd":[{"id":"EUVD-2018-20577","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.","status":"published","published":"2018-03-24T21:00:00Z","modified":"2024-08-05T07:10:47Z","updated_at":"2026-11-03T02:40:01.4233Z"}],"ghsa":[{"id":"GHSA-7gr4-mrjx-cjx9","title":"The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2...","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.","status":"published","published":"2022-05-14T03:29:32Z","modified":"2023-02-02T05:07:41Z","cvss":[{"version":"3.0","score":7.4,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:52:33.872402Z"}],"nvd":[{"id":"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.","status":"published","published":"2018-03-24T21:29:00.227Z","modified":"2026-06-17T02:05:44.81Z","cvss":[{"version":"3.0","score":7.4,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:04:24.264003Z"}],"osv":[{"id":"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.","status":"published","published":"2018-03-24T21:29:00.227Z","modified":"2026-10-24T14:20:20.862152359Z","cvss":[{"version":"3.0","score":7.4,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:10.051046Z"},{"id":"openSUSE-SU-2024:10985-1","title":"libcrypto46-3.3.4-1.2 on GA media","description":"These are all security issues fixed in the libcrypto46-3.3.4-1.2 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:11:33.250971Z","updated_at":"2026-11-02T16:58:34.894275Z"}]}}