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CVE-2018-0732

Client DoS due to large DH parameter

High7.5EPSS 47.0%
Published
Updated
Reserved
Assigned by
openssl

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).

Scores

CVSS scores of CVE-2018-0732, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
47.0% · top 1.2% of all CVEs (3 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial

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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • OpenSSL · OpenSSL

    • affected Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h)
    • affected Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o)

References (37)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .