CVE WatchOct 8, 2026

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.

CVSS

7.5

High

EPSS

47.0%

p99

KEV

—

Exploit Today

0-100

Published: Jun 12, 2018 · Last modified: Oct 8, 2026 · CWE-320

EPSS · 30d

47.0%EPSS · 30 days48.8%

2026-09-302026-10-27

Technical 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).

Official references

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