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Fencer Intel
medium 5.5

CVE-2016-7056 json

A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 priv…

published 2018-09-10 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7936

cvss
5.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 private keys.

Patch / fix

  • openssl Debian 14, Debian 13, Debian 12 1.0.2a-1

debian advisories DEBIAN-CVE-2016-7056

  • openssl Ubuntu 14.04 LTS 1.0.1f-1ubuntu2.22

ubuntu advisories UBUNTU-CVE-2016-7056

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

  • tomcat7 jboss enterprise web server 3.1 7.0.70-22.ep7.el6
  • tomcat7 jboss enterprise web server 3.1 7.0.70-22.ep7.el7
  • tomcat8 jboss enterprise web server 3.1 8.0.36-24.ep7.el6
  • tomcat8 jboss enterprise web server 3.1 8.0.36-24.ep7.el7
  • log4j-eap6 jboss enterprise web server 3.1 1.2.16-12.redhat_3.1.ep6.el6
  • log4j-eap6 jboss enterprise web server 3.1 1.2.16-12.redhat_3.1.ep6.el7
  • tomcat7-lib jboss enterprise web server 3.1 7.0.70-22.ep7.el6
  • tomcat7-lib jboss enterprise web server 3.1 7.0.70-22.ep7.el7

red hat advisories RHSA-2017:1801RHSA-2017:1414RHSA-2017:1413RHBA-2017:1929

  • compat-openssl098 SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLED 12 SP2 +2 more 0.9.8j-105.1
  • openssl Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +7 more 0.9.8j-0.105.1
  • openssl1 SLES 11-SECURITY 1.0.1g-0.57.1
  • openssl SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 1.0.1i-54.5.1
  • openssl SLES 12-LTSS 1.0.1i-27.28.1

suse advisories SUSE-SU-2018:0112-1SUSE-SU-2017:0605-1SUSE-SU-2017:0585-1SUSE-SU-2017:0495-1SUSE-SU-2017:0461-1

  • openssl-1_0_0 openSUSE Tumbleweed 1.0.2u-6.2
  • openssl-1_1 openSUSE Tumbleweed 1.1.1l-1.2

opensuse advisories openSUSE-SU-2024:11126-1openSUSE-SU-2024:11127-1

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-2016-7056 updated cvss 5.5

openssl: ECDSA P-256 timing attack key recovery

  • Red Hat Enterprise Linux 6 openssl, openssl-perl
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer Red Hat JBoss Enterprise Web Server 1 openssl
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Web Server 3 openssl
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux Client (v. 7) openssl 1.0.2k-8.el7, openssl-libs 1.0.2k-8.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssl-perl 1.0.2k-8.el7 Red Hat Enterprise Linux ComputeNode (v. 7) openssl 1.0.2k-8.el7, openssl-libs 1.0.2k-8.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssl-perl 1.0.2k-8.el7 Red Hat Enterprise Linux Server (v. 7) openssl 1.0.2k-8.el7, openssl-libs 1.0.2k-8.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssl-perl 1.0.2k-8.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) openssl 1.0.2k-8.el7, openssl-libs 1.0.2k-8.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) openssl-perl 1.0.2k-8.el7
    fixed: vendor fix RHBA-2017:1929
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2017:1415
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-httpd 2.4.23-120.jbcs.el6, jbcs-httpd24-openssl 1.0.2h-13.jbcs.el6, jbcs-httpd24-mod_ssl 2.4.23-120.jbcs.el6, jbcs-httpd24-mod_ldap 2.4.23-120.jbcs.el6, jbcs-httpd24-httpd-libs 2.4.23-120.jbcs.el6, jbcs-httpd24-httpd-tools 2.4.23-120.jbcs.el6, +7 more
    fixed: vendor fix RHSA-2017:1414
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.23-120.jbcs.el7, jbcs-httpd24-openssl 1.0.2h-13.jbcs.el7, jbcs-httpd24-mod_ssl 2.4.23-120.jbcs.el7, jbcs-httpd24-mod_ldap 2.4.23-120.jbcs.el7, jbcs-httpd24-httpd-libs 2.4.23-120.jbcs.el7, jbcs-httpd24-httpd-tools 2.4.23-120.jbcs.el7, +7 more
    fixed: vendor fix RHSA-2017:1413
  • Red Hat JBoss Web Server 3.1
    fixed: vendor fix RHSA-2017:1802
show 2 more
  • Red Hat JBoss Web Server 3.1 for RHEL 6 tomcat7 7.0.70-22.ep7.el6, tomcat8 8.0.36-24.ep7.el6, tomcat7-lib 7.0.70-22.ep7.el6, tomcat8-lib 8.0.36-24.ep7.el6, tomcat7-jsvc 7.0.70-22.ep7.el6, tomcat8-jsvc 8.0.36-24.ep7.el6, +20 more Red Hat JBoss Web Server 3.1 for RHEL 7 tomcat7 7.0.70-22.ep7.el7, tomcat8 8.0.36-24.ep7.el7, tomcat7-lib 7.0.70-22.ep7.el7, tomcat8-lib 8.0.36-24.ep7.el7, tomcat7-jsvc 7.0.70-22.ep7.el7, tomcat8-jsvc 8.0.36-24.ep7.el7, +20 more
    fixed: vendor fix RHSA-2017:1801
  • Red Hat Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl098e Red Hat Enterprise Linux 7 openssl098e Red Hat JBoss Enterprise Application Platform 6 openssl Red Hat JBoss Enterprise Web Server 2 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

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • The OpenSSL Project openssl

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel 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.