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Fencer Vulns
medium 5.9

CVE-2016-7055 json

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c tha…

published 2017-05-04 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7935

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
14.2%
EPSS 14.2% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

Patch / fix

  • openssl openssl 1.0.2k, 1.1.0c
  • nodejs node.js 4.7.3, 6.9.5, 7.5.0
  • openssl Debian 14, Debian 13, Debian 12 1.1.0c-1

debian advisories DEBIAN-CVE-2016-7055

  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.6

ubuntu advisories UBUNTU-CVE-2016-7055

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

  • jbcs-httpd24-apr jboss core services 1 1.6.3-14.jbcs.el7
  • jbcs-httpd24-httpd jboss core services 1 2.4.29-17.jbcs.el7
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.43-1.redhat_1.jbcs.el7
  • jbcs-httpd24-mod_rt jboss core services 1 2.4.1-19.GA.jbcs.el7
  • jbcs-httpd24-mod_bmx jboss core services 1 0.9.6-17.GA.jbcs.el7
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.29-17.jbcs.el7
  • jbcs-httpd24-nghttp2 jboss core services 1 1.29.0-8.jbcs.el7
  • jbcs-httpd24-openssl jboss core services 1 1:1.0.2n-11.jbcs.el7

red hat advisories RHSA-2018:2185RHSA-2018:2186

  • nodejs4 SLE Module for Web and Scripting 12, Enterprise Storage 4 4.7.3-14.1
  • openssl SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.0.2j-59.1
  • nodejs6 SLE Module for Web and Scripting 12 6.9.5-7.1

suse advisories SUSE-SU-2017:0855-1SUSE-SU-2017:0441-1SUSE-SU-2017:0431-1

  • 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 3.4, Alpine 3.3, Alpine 3.2 1.0.2k-r0

alpine advisories ALPINE-CVE-2016-7055

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 1.0.2.k-1
  • lib32-openssl Arch Linux 1:1.0.2.k-1

arch linux advisories AVG-154AVG-155AVG-67AVG-68

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-2016-7055 updated cvss 3.7

openssl: Carry propagating bug in Montgomery multiplication

  • Red Hat JBoss Core Services jbcs-httpd24-openssl Red Hat JBoss Enterprise Application Platform 6 openssl Red Hat JBoss Enterprise Web Server 2 openssl
    affected: no fix planned “Will not fix”
  • 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 Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl Red Hat Enterprise Linux 7 OVMF, openssl, openssl098e, openssl-libs, openssl-perl Red Hat JBoss Enterprise Web Server 1 openssl Red Hat JBoss Enterprise Web Server 3 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

14.22% chance of exploitation in the next 30 days, higher than 96% 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:N/I:N/A:H
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:N/I:N/A:P

Classification

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.