--- 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 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.com/errata/RHSA-2018:3505' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1296' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1297' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1543' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4 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/201811-03' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20181105-0001/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20190118-0002/' 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/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/20180612.txt' 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/security-alerts/cpujan2021.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.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.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 epss: 0.48831 epssPercentile: 0.98849 ingestedAt: '2026-10-08T23:16:47.290Z' --- ## Overview 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 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). ## 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` ## Remediation Upgrade past the affected range: - `node.js 10.9.0`