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Fencer Vulns
medium 5.9

CVE-2018-0735 json

Timing attack against ECDSA signature generation

published 2018-10-29 8 y ago modified 2026-10-08 31 d ago also EUVD-2018-1545

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.7%
EPSS 4.7% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

The OpenSSL ECDSA 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 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.1.1a (Affected 1.1.1).

Patch / fix

  • nodejs node.js 10.12.0, 11.3.0
  • oracle vm_virtualbox 5.2.24, 6.0.0
  • openssl Debian 14, Debian 13, Debian 12 1.1.1a-1

debian advisories DEBIAN-CVE-2018-0735

  • openssl Ubuntu 18.04 LTS 1.1.0g-2ubuntu4.3

ubuntu advisories UBUNTU-CVE-2018-0735

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl RHEL 8 1:1.1.1c-2.el8
  • openssl-libs RHEL 8 1:1.1.1c-2.el8
  • openssl-perl RHEL 8 1:1.1.1c-2.el8
  • openssl RHEL 7 1:1.0.2k-16.el7_6.1
  • openssl-libs RHEL 7 1:1.0.2k-16.el7_6.1
  • openssl-perl RHEL 7 1:1.0.2k-16.el7_6.1

red hat advisories RHSA-2019:3700RHSA-2019:0483

  • openssl-1_1 SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 1.1.1-2.3.1
  • openssl-1_1 SLE Module for Basesystem 15 1.1.0i-4.15.1

suse advisories SUSE-SU-2018:3945-1SUSE-SU-2018:3863-1

  • openssl-1_1 openSUSE Tumbleweed 1.1.1l-1.2

opensuse advisories openSUSE-SU-2024:11127-1

  • nodejs Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 10.14.0-r0
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.1.1a-r0
  • openssl3 Alpine 3.16, Alpine 3.15 1.1.1a-r0
  • nodejs-current Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 11.3.0-r0
  • openssl1.1-compat Alpine 3.18, Alpine 3.17 1.1.1a-r0

alpine advisories ALPINE-CVE-2018-0735

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl Arch Linux 1.1.1.a-1
  • lib32-openssl Arch Linux 1:1.1.1.a-1

arch linux advisories AVG-792AVG-793

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-0735 updated cvss 5.1

openssl: timing side channel attack in the ECDSA signature generation

  • Red Hat Enterprise Linux 6 openssl, openssl-perl Red Hat Enterprise Linux 7 OVMF
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux BaseOS (v. 8) openssl 1.1.1c-2.el8, openssl-libs 1.1.1c-2.el8, openssl-perl 1.1.1c-2.el8
    fixed: vendor fix RHSA-2019:3700
  • Red Hat Enterprise Linux Client (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Client Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux ComputeNode (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Server Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Workstation (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Workstation Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1
    fixed: vendor fix RHSA-2019:0483
  • Red Hat Enterprise Linux 5 openssl Red Hat Enterprise Linux 6 openssl098e Red Hat Enterprise Linux 7 openssl098e Red Hat Enterprise Linux 8 mingw-openssl, mingw32-openssl, mingw64-openssl, compat-openssl10 Red Hat JBoss Core Services jbcs-httpd24-openssl Red Hat JBoss Enterprise Application Platform 5 openssl
    +4 more products
    Red Hat JBoss Enterprise Application Platform 6 openssl Red Hat JBoss Enterprise Web Server 2 openssl Red Hat JBoss Web Server 3 openssl Red Hat OpenShift Enterprise 3 openssl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
31 d ago

Exploit prediction

4.72% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • OpenSSL OpenSSL

Classification

Weakness
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.