CVE-2016-0739

mediumpriority · track · 25EPSS 0.024 · 84 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.43% (84th) EPSS

CVSS 4.3 · medium

Is it mine?

22 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedlibssh-0:0.7.1-2.el7.src as a component of Red Hat Enterprise Linux 7 Extrasredhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2016:0566
Fixedlibssh-0:0.7.1-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7 Extrasredhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2016:0566
Fixedlibssh-debuginfo-0:0.7.1-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7 Extrasredhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2016:0566
Fixedlibssh-devel-0:0.7.1-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7 Extrasredhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2016:0566

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Nsecondary · Red Hat Product Security US

v3.05.4mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200USprimaryCWE-704US

affected products (22)

Products and version ranges known to be affected.

Dell NetWorker virtualall versionscert_bundDEcpe:/a:dell:networker:virtual
EMC Avamarall versionscert_bundDEcpe:/a:emc:avamar:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linux Enterprise Desktop 12all versionscert_bundDEcpe:/o:suse:linux_enterprise_desktop:12
SUSE Linux Enterprise Desktop 12 SP1all versionscert_bundDEcpe:/o:suse:linux_enterprise_desktop:12:sp1
Ubuntu Linux 12.04 LTSall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:12.04::~~lts~~~
Ubuntu Linux 14.04 LTSall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:14.04::~~lts~~~
Ubuntu Linux 15.10all versionscert_bundDEcpe:/o:canonical:ubuntu_linux:15.10
n/a n/a≤ n/aenisa_euvdEU
canonical ubuntu linux= 12.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 14.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 15.10nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
debian debian linux= 7.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
fedoraproject fedora= 22nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
fedoraproject fedora= 23nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
libssh libssh≤ 0.7.2nvdUScpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
redhat enterprise linux= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux:*:*:*:*:*:*:*:*
libssh-0:0.7.1-2.el7.src as a component of Red Hat Enterprise Linux 7 Extrasall versionsfixedredhat_csafUS
libssh-0:0.7.1-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7 Extrasall versionsfixedredhat_csafUS

showing 20 of 22

advisories (2)

Vendor and ecosystem advisories describing this.

RHSA-2016:0566Red Hat Security Advisory: libssh security update2016-03-31csaf · redhat_csafUS
An update for libssh is now available for Red Hat Enterprise Linux 7 Extras. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
WID-SEC-W-2024-1054libssh: Mehrere SchwachstellenDeutsch2016-02-23csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in libssh und Ubuntu Linux ausnutzen, um einen Denial of Service Angriff durchzuführen oder Sicherheitsmechanismen zu umgehen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd redhat_csaf NVD CVE.org MITRE

published 2016-04-13modified 2026-06-17

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references (29)

External citations — patches, advisories, analysis.

scry

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