CVE-2018-0732
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 47.0%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 47.01% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-320
- Affected
- openssl/openssl · canonical/ubuntu linux · debian/debian linux · nodejs/node.js
- Source
- openssl-security@openssl.org
EPSS moved from 47.0% on 25 October 2026 to 47.0% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/104442Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041090Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2552Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2553Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3221Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3505Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1296Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1297Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1543Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdfThird 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.htmlThird 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/201811-03Third 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/133Third 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-4348Third Party Advisory
- https://www.debian.org/security/2018/dsa-4355Third Party Advisory
- https://www.openssl.org/news/secadv/20180612.txtVendor Advisory
- https://www.oracle.com/security-alerts/cpuapr2020.htmlThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.