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Fencer Vulns
medium 5.9

CVE-2017-3738 json

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli.

published 2017-12-07 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-12855

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.4%
EPSS 13.4% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. 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 DH1024 are considered just feasible, 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 significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.

Patch / fix

  • nodejs node.js 4.8.7, 6.12.2, 8.9.3, 9.2.1
  • openssl Debian 14, Debian 13, Debian 12 1.1.0h-1

debian advisories DEBIAN-CVE-2017-3738

  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.10
  • openssl Ubuntu 18.04 LTS 1.1.0g-2ubuntu3

ubuntu advisories UBUNTU-CVE-2017-3738

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-2018:2186RHSA-2018:0998

  • 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-60.20.2
  • 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
  • mozilla-nspr SLES 11 SP4-LTSS 4.21-29.6.1
  • firefox-cairo SLES 11 SP4-LTSS 1.15.10-2.13.4

suse advisories SUSE-SU-2019:14246-1SUSE-SU-2018:0293-1SUSE-SU-2018:0002-1SUSE-SU-2017:3343-1

  • 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 1.0.2n-r0

alpine advisories ALPINE-CVE-2017-3738

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

arch linux advisories AVG-540AVG-551

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-2017-3738 updated cvss 5.9

openssl: rsaz_1024_mul_avx2 overflow bug on x86_64

  • Red Hat JBoss Enterprise Application Platform 5 openssl
    affected: no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform 6 openssl Red Hat JBoss Enterprise Web Server 2 openssl Red Hat JBoss Enterprise Web Server 3 openssl
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Web Server 3 openssl
    affected: no fix available
  • 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 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 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
    +4 more products
    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 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 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, openssl098e Red Hat Enterprise Linux 8 openssl, openssl-libs, openssl-perl Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    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 ICSA-19-155-01 updated cvss 5.9

PHOENIX CONTACT PLCNext AXC F 2152

  • Phoenix Contact AXC F 2152 2404267 version 1.x, 1046568 (Starterkit) version 1.x
    affected: vendor fix, mitigation “Phoenix Contact recommends affected users update to firmware release 2019.0 LTS or later, update to PLCNext Engineer release 2019.0 LTS or later, and apply the following specific mitigations below:” phoenixcontact.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

13.41% 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: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 Software Foundation OpenSSL

Classification

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