Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2018-0732

CVE-2018-0732HIGH

OpenSSL OpenSSL — Client DoS due to large DH parameter

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .4883   98.9     —

AFFECTED
  Product  Versions                                               Fixed
  OpenSSL  Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h) –  —

TIMELINE
  Nov 30  Reserved by openssl
  Jun 12  Published (CNA: openssl)
  Oct 8   ENRICHED — CVE-2018-0732 (OpenSSL). Received CVSS 7.5 and CPE data from NVD.

CWE-320 · CNA: openssl · CVSS v3.1 · 37 references · NVD status: Modified

Description

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).

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
November 30, 2017	Reserved	Reserved by openssl
June 12, 2018	Published	Published (CNA: openssl)
October 8, 2026	ENRICHED	ENRICHED — CVE-2018-0732 (OpenSSL). Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
OpenSSL	OpenSSL	—	Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h)	—

Weaknesses

CWE-320

References (37)

http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html [Patch, Third Party Advisory]
http://www.securityfocus.com/bid/104442 [Third Party Advisory, VDB Entry]
http://www.securitytracker.com/id/1041090 [Third Party Advisory, VDB Entry]
https://access.redhat.com/errata/RHSA-2018:2552 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2018:2553 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2018:3221 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2018:3505 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1296 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1297 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1543 [Third Party Advisory]
https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf [Third Party Advisory]
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.debian.org/debian-lts-announce/2018/07/msg00043.html [Third Party Advisory]
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://nodejs.org/en/blog/vulnerability/august-2018-security-releases/ [Vendor Advisory]
https://security.gentoo.org/glsa/201811-03 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20181105-0001/ [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20190118-0002/ [Third Party Advisory]
https://securityadvisories.paloaltonetworks.com/Home/Detail/133 [Third Party Advisory]
https://usn.ubuntu.com/3692-1/ [Third Party Advisory]
https://usn.ubuntu.com/3692-2/ [Third Party Advisory]
https://www.debian.org/security/2018/dsa-4348 [Third Party Advisory]
https://www.debian.org/security/2018/dsa-4355 [Third Party Advisory]
https://www.openssl.org/news/secadv/20180612.txt [Vendor Advisory]
https://www.oracle.com/security-alerts/cpuapr2020.html [Third Party Advisory]
https://www.oracle.com/security-alerts/cpujan2021.html [Third Party Advisory]
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html [Patch, Third Party Advisory]
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html [Patch, Third Party Advisory]
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html [Patch, Third Party Advisory]
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html [Patch, Third Party Advisory]
https://www.tenable.com/security/tns-2018-12 [Third Party Advisory]
https://www.tenable.com/security/tns-2018-13 [Third Party Advisory]
https://www.tenable.com/security/tns-2018-14 [Third Party Advisory]
https://www.tenable.com/security/tns-2018-17 [Third Party Advisory]

Authoritative record: CVE-2018-0732 at cve.org

Vendors: openssl

Weaknesses: CWE-320

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2018-0732 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.