High
Security advisory
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).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-0732
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:38 UTC · Revision 1
Source evidence
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).
osv:CVE-2018-0732
Complete source record
{
"id": "2842b961afa5627c9508d82c7059d1c5cd7ddab29d2e60d6b4bdf717bc75f3f1",
"url": "https://osv.dev/vulnerability/CVE-2018-0732",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-0732",
"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 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).",
"evidence": "osv:CVE-2018-0732",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-0732",
"aliases": [
"CVE-2018-0732"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nodejs/node",
"type": "GIT",
"events": [
{
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{
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{
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{
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{
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{
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{
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},
{
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{
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"range": [
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{
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}
],
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},
{
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"range": [
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},
{
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}
],
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},
{
"cpe": "cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*",
"range": [
{
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},
{
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}
],
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},
{
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},
{
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}
],
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},
{
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"range": [
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{
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}
],
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}
]
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}
],
"versions": [
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"v10.6.0",
"v10.5.0",
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"v8.11.3",
"v6.14.3",
"v10.4.0",
"v10.3.0",
"v10.2.1",
"v10.2.0",
"v8.11.2",
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"v8.11.1",
"v6.14.1",
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"v8.10.0",
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"v6.13.0",
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"v8.2.0",
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"v6.11.1",
"v8.1.3",
"v8.1.2",
"v8.1.1",
"v8.1.0",
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"v8.0.0",
"v6.10.3",
"v6.10.2",
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"v6.10.0",
"v6.9.5",
"v6.9.4",
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"v6.9.2",
"v6.9.1",
"v6.9.0",
"v6.8.0",
"v6.7.0",
"v6.6.0",
"v6.5.0",
"v6.4.0",
"v6.3.1",
"v6.3.0",
"v6.2.2",
"v6.2.1",
"v6.2.0",
"v6.1.0",
"v6.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-0732.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/openssl/openssl",
"type": "GIT",
"events": [
{
"introduced": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
},
{
"last_affected": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
},
{
"introduced": "7ea5bd2b52d0e81eaef3d109b3b12545306f201c"
},
{
"last_affected": "7ea5bd2b52d0e81eaef3d109b3b12545306f201c"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0.2"
},
{
"last_affected": "1.0.2o"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.1.0"
},
{
"last_affected": "1.1.0h"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"OpenSSL_1_0_2u",
"OpenSSL_1_1_0l"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-0732.json"
}
}
],
"modified": "2026-10-24T10:30:21.174295109Z",
"provider": "osv",
"references": [
"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098",
"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/",
"https://access.redhat.com/errata/RHSA-2018:2552",
"https://access.redhat.com/errata/RHSA-2018:2553",
"https://access.redhat.com/errata/RHSA-2018:3221",
"https://access.redhat.com/errata/RHSA-2018:3505",
"https://access.redhat.com/errata/RHSA-2019:1296",
"https://access.redhat.com/errata/RHSA-2019:1297",
"https://access.redhat.com/errata/RHSA-2019:1543",
"https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf",
"https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html",
"https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/",
"https://security.gentoo.org/glsa/201811-03",
"https://security.netapp.com/advisory/ntap-20181105-0001/",
"https://security.netapp.com/advisory/ntap-20190118-0002/",
"https://securityadvisories.paloaltonetworks.com/Home/Detail/133",
"https://usn.ubuntu.com/3692-1/",
"https://usn.ubuntu.com/3692-2/",
"https://www.debian.org/security/2018/dsa-4348",
"https://www.debian.org/security/2018/dsa-4355",
"https://www.openssl.org/news/secadv/20180612.txt",
"https://www.oracle.com/security-alerts/cpuapr2020.html",
"https://www.oracle.com/security-alerts/cpujan2021.html",
"https://www.tenable.com/security/tns-2018-12",
"https://www.tenable.com/security/tns-2018-13",
"https://www.tenable.com/security/tns-2018-14",
"https://www.tenable.com/security/tns-2018-17",
"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html",
"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html",
"https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html",
"https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
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"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
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{
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{
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{
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{
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},
{
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},
{
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{
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{
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},
{
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}
],
"source": "CPE_STRING"
}
]
},
{
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],
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{
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{
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},
{
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}
],
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}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-0732",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430433,
"published_at": "2018-06-12T13:29:00.207+00:00"
}