{"id":"CVE-2018-0737","title":"The OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a cache timing side channel attack","summary":"The OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a cache timing side channel attack. An attacker with sufficient access to mount cache timing attacks during the RSA key generation process could recover the priv…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-327"],"vendor":"openssl","product":"openssl","affected":["openssl >= 1.0.2b, <= 1.0.2o","openssl >= 1.1.0, <= 1.1.0h","ubuntu_linux = 14.04","ubuntu_linux = 16.04","ubuntu_linux = 17.10"],"published":"2018-04-16","updated":"2026-10-15","sourceUpdated":"2026-10-15T18:17:05.900","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2018-0737","references":[{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","label":"openssl-security@openssl.org"},{"url":"http://www.securityfocus.com/bid/103766","label":"openssl-security@openssl.org"},{"url":"http://www.securitytracker.com/id/1040685","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:3221","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:3505","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:3932","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:3933","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:3935","label":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=349a41da1ad88ad87825414752a8ff5fdd6a6c3f","label":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6939eab03a6e23d2bd2c3f5e34fe1d48e542e787","label":"openssl-security@openssl.org"},{"url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html","label":"openssl-security@openssl.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/","label":"openssl-security@openssl.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/","label":"openssl-security@openssl.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/","label":"openssl-security@openssl.org"},{"url":"https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/","label":"openssl-security@openssl.org"},{"url":"https://security.gentoo.org/glsa/201811-21","label":"openssl-security@openssl.org"},{"url":"https://security.netapp.com/advisory/ntap-20180726-0003/","label":"openssl-security@openssl.org"},{"url":"https://securityadvisories.paloaltonetworks.com/Home/Detail/133","label":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/3628-1/","label":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/3628-2/","label":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/3692-1/","label":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/3692-2/","label":"openssl-security@openssl.org"},{"url":"https://www.debian.org/security/2018/dsa-4348","label":"openssl-security@openssl.org"},{"url":"https://www.debian.org/security/2018/dsa-4355","label":"openssl-security@openssl.org"},{"url":"https://www.openssl.org/news/secadv/20180416.txt","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/security-alerts/cpuapr2020.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-12","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-13","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-14","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2018-17","label":"openssl-security@openssl.org"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/103766","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1040685","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:3221","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:3505","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:3932","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:3933","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:3935","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=349a41da1ad88ad87825414752a8ff5fdd6a6c3f","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6939eab03a6e23d2bd2c3f5e34fe1d48e542e787","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201811-21","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20180726-0003/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://securityadvisories.paloaltonetworks.com/Home/Detail/133","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3628-1/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3628-2/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3692-1/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3692-2/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2018/dsa-4348","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2018/dsa-4355","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openssl.org/news/secadv/20180416.txt","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2020.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2018-12","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2018-13","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2018-14","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2018-17","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T17:19:07.239978Z"},"epss":0.11597,"epssPercentile":0.96018,"ingestedAt":"2026-10-15T18:23:58.393Z","slug":"CVE-2018-0737","body":"## Overview\n\nThe OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a cache timing side channel attack. An attacker with sufficient access to mount cache timing attacks during the RSA key generation process could recover the private key. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2b-1.0.2o).\n\n## Affected\n\n- `openssl >= 1.0.2b, <= 1.0.2o`\n- `openssl >= 1.1.0, <= 1.1.0h`\n- `ubuntu_linux = 14.04`\n- `ubuntu_linux = 16.04`\n- `ubuntu_linux = 17.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":32.5,"likelihood":2.3,"exploitation":0,"ransomware":0},"changes":[]}