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. 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

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

47% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)

CWE

CWE-320

Published

2018-06-12

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• canonical:ubuntu_linux
• debian:debian_linux
• nodejs:node.js
• openssl:openssl

References

• http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
• http://www.securityfocus.com/bid/104442
• http://www.securitytracker.com/id/1041090
• https://access.redhat.com/errata/RHSA-2018:2552
• https://access.redhat.com/errata/RHSA-2018:2553

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