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Fencer Intel
medium 6.5

CVE-2017-3736 json

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g.

published 2017-11-02 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-12853

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.1%
EPSS 10.1% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. This only affects processors that support the BMI1, BMI2 and ADX extensions like Intel Broadwell (5th generation) and later or AMD Ryzen.

Patch / fix

  • openssl openssl 1.0.2m, 1.1.0g
  • openssl Debian 14, Debian 13, Debian 12 1.1.0g-1

debian advisories DEBIAN-CVE-2017-3736

  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.9
  • openssl Ubuntu 18.04 LTS 1.0.2g-1ubuntu14

ubuntu advisories UBUNTU-CVE-2017-3736

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

  • java-1.8.0-ibm RHEL 6 EXTRAS, network satellite 5.8 1:1.8.0.5.20-1jpp.1.el6_10
  • java-1.8.0-ibm-src RHEL 6 EXTRAS 1:1.8.0.5.20-1jpp.1.el6_10
  • java-1.8.0-ibm-demo RHEL 6 EXTRAS 1:1.8.0.5.20-1jpp.1.el6_10
  • java-1.8.0-ibm-jdbc RHEL 6 EXTRAS 1:1.8.0.5.20-1jpp.1.el6_10
  • java-1.8.0-ibm-plugin RHEL 6 EXTRAS 1:1.8.0.5.20-1jpp.1.el6_10
  • java-1.8.0-ibm RHEL 7 EXTRAS 1:1.8.0.5.20-1jpp.1.el7
  • java-1.8.0-ibm-src RHEL 7 EXTRAS 1:1.8.0.5.20-1jpp.1.el7
  • java-1.8.0-ibm-demo RHEL 7 EXTRAS 1:1.8.0.5.20-1jpp.1.el7

red hat advisories RHSA-2018:2713RHSA-2018:2575RHSA-2018:2568RHSA-2018:2185RHSA-2018:2186RHSA-2018:0998

  • java-1_8_0-ibm SLES 12 SP3, SLES 12 SP2-BCL, SLE Software Development Kit 12 SP3 +7 more 1.8.0_sr5.20-30.36.1
  • java-1_8_0-ibm SLE Module for Legacy 15 1.8.0_sr5.20-3.6.2
  • nodejs6 SLE Module for Web and Scripting 12, OpenStack Cloud 7, Enterprise Storage 4 6.12.2-11.8.1
  • nodejs4 SLE Module for Web and Scripting 12, Enterprise Storage 4 4.8.7-15.8.1
  • openssl SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +6 more 1.0.2j-60.16.1
  • firefox-atk SLES 11 SP4-LTSS 2.26.1-2.8.4
  • mozilla-nss SLES 11 SP4-LTSS 3.45-38.9.3
  • firefox-gtk3 SLES 11 SP4-LTSS 3.10.9-2.15.3

suse advisories SUSE-SU-2019:14246-1SUSE-SU-2018:2839-2SUSE-SU-2018:3082-1SUSE-SU-2018:2839-1SUSE-SU-2018:0293-1SUSE-SU-2018:0002-1

  • 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

  • openssl Alpine 3.8, Alpine 3.7, Alpine 3.6 +3 more 1.0.2m-r0

alpine advisories ALPINE-CVE-2017-3736

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 1.1.0.g-1
  • lib32-openssl Arch Linux 1:1.1.0.g-1

arch linux advisories AVG-477AVG-478

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-2017-3736 updated cvss 5.9

openssl: bn_sqrx8x_internal carry bug on x86_64

  • Red Hat JBoss Enterprise Application Platform 6 openssl
    affected: no fix available
  • Red Hat JBoss Enterprise Web Server 2 openssl
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 OVMF Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    under investigation
  • Red Hat Enterprise Linux Client (v. 7) openssl 1.0.2k-12.el7, openssl-libs 1.0.2k-12.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssl-perl 1.0.2k-12.el7
    fixed: vendor fix RHSA-2018:0998
  • Red Hat Enterprise Linux Client Supplementary (v. 7) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-jdbc 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-plugin 1.8.0.5.20-1jpp.1.el7
    fixed: vendor fix RHSA-2018:2568
  • Red Hat Enterprise Linux ComputeNode (v. 7) openssl 1.0.2k-12.el7, openssl-libs 1.0.2k-12.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssl-perl 1.0.2k-12.el7
    fixed: vendor fix RHSA-2018:0998
  • Red Hat Enterprise Linux ComputeNode Supplementary (v. 7) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el7
    fixed: vendor fix RHSA-2018:2568
  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-jdbc 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-plugin 1.8.0.5.20-1jpp.1.el6_10
    fixed: vendor fix RHSA-2018:2575
show 13 more
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) openssl 1.0.2k-12.el7, openssl-libs 1.0.2k-12.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) openssl-perl 1.0.2k-12.el7
    fixed: vendor fix RHSA-2018:0998
  • Red Hat Enterprise Linux HPC Node Supplementary (v. 6) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el6_10
    fixed: vendor fix RHSA-2018:2575
  • Red Hat Enterprise Linux Server (v. 7) openssl 1.0.2k-12.el7, openssl-libs 1.0.2k-12.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssl-perl 1.0.2k-12.el7
    fixed: vendor fix RHSA-2018:0998
  • Red Hat Enterprise Linux Server Supplementary (v. 6) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-jdbc 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-plugin 1.8.0.5.20-1jpp.1.el6_10
    fixed: vendor fix RHSA-2018:2575
  • Red Hat Enterprise Linux Server Supplementary (v. 7) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-jdbc 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-plugin 1.8.0.5.20-1jpp.1.el7
    fixed: vendor fix RHSA-2018:2568
  • Red Hat Enterprise Linux Workstation (v. 7) openssl 1.0.2k-12.el7, openssl-libs 1.0.2k-12.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) openssl-perl 1.0.2k-12.el7
    fixed: vendor fix RHSA-2018:0998
  • Red Hat Enterprise Linux Workstation Supplementary (v. 6) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-jdbc 1.8.0.5.20-1jpp.1.el6_10, java-1.8.0-ibm-plugin 1.8.0.5.20-1jpp.1.el6_10
    fixed: vendor fix RHSA-2018:2575
  • Red Hat Enterprise Linux Workstation Supplementary (v. 7) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-src 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-demo 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-jdbc 1.8.0.5.20-1jpp.1.el7, java-1.8.0-ibm-plugin 1.8.0.5.20-1jpp.1.el7
    fixed: vendor fix RHSA-2018:2568
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2018:2187
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-14.jbcs.el6, jbcs-httpd24-httpd 2.4.29-17.jbcs.el6, jbcs-httpd24-apr-util 1.6.1-9.jbcs.el6, jbcs-httpd24-nghttp2 1.29.0-8.jbcs.el6, jbcs-httpd24-mod_ssl 2.4.29-17.jbcs.el6, jbcs-httpd24-openssl 1.0.2n-11.jbcs.el6, +25 more
    fixed: vendor fix RHSA-2018:2186
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-14.jbcs.el7, jbcs-httpd24-httpd 2.4.29-17.jbcs.el7, jbcs-httpd24-apr-util 1.6.1-9.jbcs.el7, jbcs-httpd24-nghttp2 1.29.0-8.jbcs.el7, jbcs-httpd24-mod_ssl 2.4.29-17.jbcs.el7, jbcs-httpd24-openssl 1.0.2n-11.jbcs.el7, +25 more
    fixed: vendor fix RHSA-2018:2185
  • Red Hat Satellite 5.8 (RHEL v.6) java-1.8.0-ibm 1.8.0.5.20-1jpp.1.el6_10
    fixed: vendor fix RHSA-2018:2713
  • Red Hat Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl Red Hat Enterprise Linux 7 openssl098e Red Hat JBoss Enterprise Application Platform 5 openssl Red Hat JBoss Web Server 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

Exploit prediction

10.13% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N

Affected products

  • OpenSSL Software Foundation OpenSSL

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
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.