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MEDIUM

CVE-2018-0734

CVSS v3

5.9

MEDIUM

EPSS Score

12.2 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-0734 Red Hat Product Security292 products fixed · 18 known affected

    openssl: timing side channel attack in the DSA signature algorithm

    openssl as a component of Red Hat Enterprise Linux 6 · openssl-devel as a component of Red Hat Enterprise Linux 6 · openssl-perl as a component of Red Hat Enterprise Linux 6

  • RHBA-2020:0547 Red Hat Product Security3 products fixed

    Red Hat Bug Fix Advisory: Container Image Rebuild for Ansible Tower 3.4 Dependency

  • RHSA-2019:3932 Red Hat Product Security110 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release on RHEL 6

  • RHSA-2019:3933 Red Hat Product Security61 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release on RHEL 7

  • RHSA-2019:3935 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release

Full record on NVD

Description

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2018-10-16
Last Modified
2026-10-08

Frequently asked questions

What is CVE-2018-0734?

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).

Is CVE-2018-0734 actively exploited?

Active exploitation of CVE-2018-0734 has not been confirmed. Its EPSS score was 12.2% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-0734?

CVE-2018-0734 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

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