{"id":"CVE-2018-12435","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-12435","generatedAt":"2026-10-28T21:18:57.522Z","title":"Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp.","description":"Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","published":"2018-06-15T02:29:00.000Z","lastModified":"2026-06-17T01:37:47.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N"},"cwe":["CWE-200"],"affected":["botan project/botan"],"epss":{"score":0.00492,"percentile":0.42036,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.49%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://botan.randombit.net/security.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://botan.randombit.net/security.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-12435","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}