{"id":"CVE-2018-12433","aliases":["EUVD-2018-4404","GHSA-h29m-v9g7-4vg2"],"status":"disputed","title":"** DISPUTED ** cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA...","description":"cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. NOTE: the vendor does not include side-channel attacks within its threat model","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":"2026-11-09","score":0.00341,"percentile":0.27782,"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":"2026-06-17T01:37:46Z","products":[{"vendor":"cryptlib","product":"cryptlib"}],"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-2018-12433"},{"url":"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem"},{"url":"https://github.com/advisories/GHSA-h29m-v9g7-4vg2"}],"sources":{"cve":[{"id":"CVE-2018-12433","description":"cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. NOTE: the vendor does not include side-channel attacks within its threat model","status":"disputed","published":"2018-06-15T02:00:00Z","modified":"2024-09-16T19:35:11.823Z","updated_at":"2026-11-02T14:35:06.679212Z"}],"euvd":[{"id":"EUVD-2018-4404","description":"cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. NOTE: the vendor does not include side-channel attacks within its threat model","status":"published","published":"2018-06-15T02:00:00Z","modified":"2024-09-16T19:35:11Z","updated_at":"2026-11-03T00:55:21.946733Z"}],"ghsa":[{"id":"GHSA-h29m-v9g7-4vg2","title":"** DISPUTED ** cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA...","description":"** DISPUTED ** cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. NOTE: the vendor does not include side-channel attacks within its threat model.","status":"published","published":"2022-05-13T01:11:27Z","modified":"2024-03-30T05:01:27Z","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":"2026-11-02T14:55:44.111751Z"}],"nvd":[{"id":"CVE-2018-12433","description":"cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. NOTE: the vendor does not include side-channel attacks within its threat model","status":"disputed","published":"2018-06-15T02:29:00.3Z","modified":"2026-06-17T01:37:46.56Z","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"}]}}