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Vulnerability record · CVE-2018-0734 · published 30 October 2018

CVE-2018-0734: Openssl broken cryptographic algorithm vulnerability

OOpenssl · Openssl

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).

5.9 CVSS 3.1 Medium EPSS 12% · top 4.0% CWE-327 · Broken cryptographic algorithm
5.9CVSS 3.1 base score, v2 4.3
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
19Affected product versions listed by NVD
58References
17 Jun 2026Last modified by 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).

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

Affected products

19 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105758 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2304 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3700 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3932 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3933 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3935 Third Party Advisory
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=43e6a58d4991a451daf4891ff05a48735df871ac
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8abfe72e8c1de1b95f50aa0d9134803b4d00070f
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ef11e19d1365eea2b1851e6f540a0bf365d303e7
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6J
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5
https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20181105-0002/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20190118-0002/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20190423-0002/ Third Party Advisory
https://usn.ubuntu.com/3840-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4348 Third Party Advisory
https://www.debian.org/security/2018/dsa-4355 Third Party Advisory
https://www.openssl.org/news/secadv/20181030.txt Vendor Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2020.html Third Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html PatchThird Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html PatchThird Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html PatchThird Party Advisory
https://www.tenable.com/security/tns-2018-16 Third Party Advisory
https://www.tenable.com/security/tns-2018-17 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105758 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2304 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3700 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3932 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3933 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3935 Third Party Advisory
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=43e6a58d4991a451daf4891ff05a48735df871ac
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8abfe72e8c1de1b95f50aa0d9134803b4d00070f
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ef11e19d1365eea2b1851e6f540a0bf365d303e7

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Source: NIST National Vulnerability Database (record CVE-2018-0734), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.