{"id":"CVE-2018-0732","title":"During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client","summary":"During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-320","CWE-325"],"vendor":"openssl","product":"openssl","affected":["openssl >= 1.0.2, <= 1.0.2o","openssl >= 1.1.0, <= 1.1.0h","ubuntu_linux = 12.04","ubuntu_linux = 14.04","ubuntu_linux = 16.04","ubuntu_linux = 17.10","ubuntu_linux = 18.04","debian_linux = 8.0","node.js >= 6.0.0, < 6.8.1","node.js >= 6.9.0, < 6.14.4","node.js >= 8.0.0, < 8.8.1","node.js >= 8.9.0, < 8.11.4","node.js >= 10.0.0, < 10.9.0"],"patched":["node.js 10.9.0"],"published":"2018-06-12","updated":"2026-10-08","sourceUpdated":"2026-10-08T22:16:42.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2018-0732","references":[{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","label":"openssl-security@openssl.org"},{"url":"http://www.securityfocus.com/bid/104442","label":"openssl-security@openssl.org"},{"url":"http://www.securitytracker.com/id/1041090","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:2552","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2018:2553","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-2019:1296","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:1297","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:1543","label":"openssl-security@openssl.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf","label":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098","label":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4","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/201811-03","label":"openssl-security@openssl.org"},{"url":"https://security.netapp.com/advisory/ntap-20181105-0001/","label":"openssl-security@openssl.org"},{"url":"https://security.netapp.com/advisory/ntap-20190118-0002/","label":"openssl-security@openssl.org"},{"url":"https://securityadvisories.paloaltonetworks.com/Home/Detail/133","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/20180612.txt","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/security-alerts/cpuapr2020.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/security-alerts/cpujan2021.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.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.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/104442","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1041090","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:2552","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2018:2553","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.c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Overview\n\nDuring key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).\n\n## Affected\n\n- `openssl >= 1.0.2, <= 1.0.2o`\n- `openssl >= 1.1.0, <= 1.1.0h`\n- `ubuntu_linux = 12.04`\n- `ubuntu_linux = 14.04`\n- `ubuntu_linux = 16.04`\n- `ubuntu_linux = 17.10`\n- `ubuntu_linux = 18.04`\n- `debian_linux = 8.0`\n- `node.js >= 6.0.0, < 6.8.1`\n- `node.js >= 6.9.0, < 6.14.4`\n- `node.js >= 8.0.0, < 8.8.1`\n- `node.js >= 8.9.0, < 8.11.4`\n- `node.js >= 10.0.0, < 10.9.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `node.js 10.9.0`\n\n## Vendor advisories\n\n- **RHSA-2019:1297** · Red Hat · fixed in: Red Hat JBoss Core Services on RHEL 6 Server, Red Hat JBoss Core Services on RHEL 7 Server · released 2019-05-30 · [advisory](https://access.redhat.com/errata/RHSA-2019:1297)\n- **RHSA-2018:3221** · Red Hat · fixed in: Red Hat Enterprise Linux Client (v. 7), Red Hat Enterprise Linux Client Optional (v. 7), Red Hat Enterprise Linux ComputeNode (v. 7), Red Hat Enterprise Linux ComputeNode Optional (v. 7), Red Hat Enterprise Linux Server (v. 7), Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7), … · released 2018-10-30 · [advisory](https://access.redhat.com/errata/RHSA-2018:3221)\n- **RHSA-2018:2553** · Red Hat · fixed in: Red Hat OpenShift Application Runtimes Node.js 10 · released 2018-08-22 · [advisory](https://access.redhat.com/errata/RHSA-2018:2553)\n- **RHSA-2018:2552** · Red Hat · fixed in: Red Hat OpenShift Application Runtimes Node.js 8 · released 2018-08-22 · [advisory](https://access.redhat.com/errata/RHSA-2018:2552)\n- **RHSA-2019:1543** · Red Hat · fixed in: JBoss Core Services Apache HTTP Server 2.4.29 SP2 · released 2019-06-18 · [advisory](https://access.redhat.com/errata/RHSA-2019:1543)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat JBoss Enterprise Application Platform 5, Red Hat JBoss Enterprise Application Platform 6, Red Hat JBoss Enterprise Web Server 2, … · no fix planned: Red Hat JBoss Enterprise Application Platform 5, Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, … · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-0732.json)","depth":"twilight","depthScore":51,"depthScoreParts":{"impact":41.3,"likelihood":9.4,"exploitation":0,"ransomware":0},"changes":[]}