libssh: bits/bytes confusion resulting in truncated Difffie-Hellman secret length
Published Apr 13, 2016
5.9
MEDIUMCVSS 3.0
EPSS 2.43%
Description
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."
Affected products
No data.
Configuration 1
- 7.0
Configuration 2
- 12.04
- 14.04
- 15.10
Configuration 4
- 22
- 23
Configuration 5
- 7.0
- 8.0
No data.
Red Hat Enterprise Linux 7 Extras
libssh-0:0.7.1-2.el7
Fixed · RHSA-2016:0566
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 Extras | libssh-0:0.7.1-2.el7 | Fixed | RHSA-2016:0566 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.43% (0.02431) | 83.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.43% (0.02431) | 82.05th | v5 (v2026.06.15) |
| Dec 4, 2025 | 4.31% (0.04313) | 88.45th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.05% (0.03048) | 85.77th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.39% (0.00390) | 74.15th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.39% (0.00390) | 72.60th | v3 (v2023.03.01) |
| Jun 6, 2023 | 0.39% (0.00390) | 69.46th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00275) | 63.05th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (14)
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html vendor-advisoryx_refsource_SUSE
- http://rhn.redhat.com/errata/RHSA-2016-0566.html vendor-advisoryx_refsource_REDHAT
- http://www.debian.org/security/2016/dsa-3488 vendor-advisoryx_refsource_DEBIAN
- http://www.ubuntu.com/usn/USN-2912-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2016-0739 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1305971 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-0739
- https://puppet.com/security/cve/CVE-2016-0739 x_refsource_CONFIRM
- https://security.gentoo.org/glsa/201606-12 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-0739
- https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/ x_refsource_CONFIRMVendor Advisory
- https://www.libssh.org/security/advisories/CVE-2016-0739.txt x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.