{"id":"CVE-2018-12438","aliases":["EUVD-2018-4409","GHSA-6xrq-423r-vrcg"],"status":"published","title":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side...","description":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","severity":{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00457,"percentile":0.39862,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200","CWE-320"],"published":"2018-06-15T02:00:00Z","modified":"2026-06-17T01:37:47Z","products":[{"vendor":"libsunec_project","product":"libsunec"}],"references":[{"url":"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/","tags":["x_refsource_MISC","x_transferred","Exploit","Technical Description","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-12438"},{"url":"https://github.com/advisories/GHSA-6xrq-423r-vrcg"}],"sources":{"cve":[{"id":"CVE-2018-12438","description":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","status":"published","published":"2018-06-15T02:00:00Z","modified":"2024-09-16T19:56:34.792Z","updated_at":"2026-11-02T14:35:06.320867Z"}],"euvd":[{"id":"EUVD-2018-4409","description":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","status":"published","published":"2018-06-15T02:00:00Z","modified":"2024-09-16T19:56:34Z","updated_at":"2026-11-03T00:55:18.708292Z"}],"ghsa":[{"id":"GHSA-6xrq-423r-vrcg","title":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side...","description":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","status":"published","published":"2022-05-13T01:11:27Z","modified":"2023-02-01T05:03:42Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:50:06.238998Z"}],"nvd":[{"id":"CVE-2018-12438","description":"The Elliptic Curve Cryptography library (aka sunec or libsunec) allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","status":"published","published":"2018-06-15T02:29:00.533Z","modified":"2026-06-17T01:37:47.217Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":1.9,"vector":"AV:L/AC:M/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-200","CWE-320"],"updated_at":"2026-11-02T14:04:29.837913Z"}]}}