CVE-2018-0732 (GCVE-0-2018-0732)
Vulnerability from cvelistv5 – Published: 2018-06-12 13:00 – Updated: 2026-10-08 21:13
VLAI
EPSS
VEX
Title
Client DoS due to large DH parameter
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).
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:08 UTC
CWE
- Client side Denial of Service
Assigner
References
37 references
Impacted products
Date Public
2018-06-12 00:00
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"url": "https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.oracle.com/security-alerts/cpujan2021.html"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.tenable.com/security/tns-2018-14"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://securityadvisories.paloaltonetworks.com/Home/Detail/133"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.tenable.com/security/tns-2018-13"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.tenable.com/security/tns-2018-17"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.tenable.com/security/tns-2018-12"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://security.netapp.com/advisory/ntap-20181105-0001/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098"
},
{
"tags": [
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],
"url": "https://www.openssl.org/news/secadv/20180612.txt"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4"
},
{
"tags": [
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],
"url": "https://security.netapp.com/advisory/ntap-20190118-0002/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf"
}
],
"title": "Client DoS due to large DH parameter",
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "openssl-security@openssl.org",
"DATE_PUBLIC": "2018-06-12",
"ID": "CVE-2018-0732",
"STATE": "PUBLIC",
"TITLE": "Client DoS due to large DH parameter"
},
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{
"product": {
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{
"product_name": "OpenSSL",
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{
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},
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}
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"lang": "eng",
"value": "Guido Vranken"
}
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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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"refsource": "SECTRACK",
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},
{
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},
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"refsource": "REDHAT",
"url": "https://access.redhat.com/errata/RHSA-2019:1296"
},
{
"name": "RHSA-2019:1543",
"refsource": "REDHAT",
"url": "https://access.redhat.com/errata/RHSA-2019:1543"
},
{
"name": "FEDORA-2019-db06efdea1",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/"
},
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"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/"
},
{
"name": "FEDORA-2019-9a0a7c0986",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/"
},
{
"name": "https://www.oracle.com/security-alerts/cpuapr2020.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
},
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},
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},
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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