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Fencer Intel
high 7.5

CVE-2016-10708 in the critical feed json

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-s…

published 2018-01-21 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-1707

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
15.7%
EPSS 15.7% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

Patch / fix

  • openbsd openssh 7.4
  • openssh Debian 14, Debian 13, Debian 12 1:7.4p1-1

debian advisories DEBIAN-CVE-2016-10708

  • openssh Ubuntu 14.04 LTS 1:6.6p1-2ubuntu2.11
  • openssh Ubuntu 16.04 LTS 1:7.2p2-4ubuntu2.6

ubuntu advisories UBUNTU-CVE-2016-10708

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

  • openssh RHEL 7 7.4p1-11.el7
  • openssh-cavs RHEL 7 7.4p1-11.el7
  • openssh-ldap RHEL 7 7.4p1-11.el7
  • openssh-keycat RHEL 7 7.4p1-11.el7
  • openssh-server RHEL 7 7.4p1-11.el7
  • openssh-askpass RHEL 7 7.4p1-11.el7
  • openssh-clients RHEL 7 7.4p1-11.el7
  • pam_ssh_agent_auth RHEL 7 0.10.3-1.11.el7

red hat advisories RHSA-2017:2029

  • openssh SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 6.2p2-0.41.5.1
  • openssh-askpass-gnome SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 6.2p2-0.41.5.1
  • openssh SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 7.2p2-74.25.1
  • openssh-askpass-gnome SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 7.2p2-74.25.1
  • openssh-openssl1 SLES 11-SECURITY 6.6p1-19.3.1
  • openssh SLES for SAP 11 SP4, SLES 11 SP4 6.6p1-36.3.1
  • openssh-askpass-gnome SLES for SAP 11 SP4, SLES 11 SP4 6.6p1-36.3.1
  • openssh SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 7.2p2-74.19.1

suse advisories SUSE-SU-2018:3540-1SUSE-SU-2018:2530-2SUSE-SU-2018:2719-1SUSE-SU-2018:2685-1SUSE-SU-2018:2530-1SUSE-SU-2018:2275-1

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-2016-10708 updated cvss 5.3

openssh: Out of sequence NEWKEYS message can allow remote attacker to cause denial of service

  • Red Hat Enterprise Linux 5 openssh Red Hat Enterprise Linux 6 openssh, openssh-ldap, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_auth
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) openssh 7.4p1-11.el7, openssh-keycat 7.4p1-11.el7, openssh-server 7.4p1-11.el7, openssh-askpass 7.4p1-11.el7, openssh-clients 7.4p1-11.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssh-cavs 7.4p1-11.el7, openssh-ldap 7.4p1-11.el7, pam_ssh_agent_auth 0.10.3-1.11.el7, openssh-server-sysvinit 7.4p1-11.el7 Red Hat Enterprise Linux ComputeNode (v. 7) openssh 7.4p1-11.el7, openssh-keycat 7.4p1-11.el7, openssh-server 7.4p1-11.el7, openssh-clients 7.4p1-11.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssh-cavs 7.4p1-11.el7, openssh-ldap 7.4p1-11.el7, openssh-askpass 7.4p1-11.el7, pam_ssh_agent_auth 0.10.3-1.11.el7, openssh-server-sysvinit 7.4p1-11.el7 Red Hat Enterprise Linux Server (v. 7) openssh 7.4p1-11.el7, openssh-keycat 7.4p1-11.el7, openssh-server 7.4p1-11.el7, openssh-askpass 7.4p1-11.el7, openssh-clients 7.4p1-11.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssh-cavs 7.4p1-11.el7, openssh-ldap 7.4p1-11.el7, pam_ssh_agent_auth 0.10.3-1.11.el7, openssh-server-sysvinit 7.4p1-11.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) openssh 7.4p1-11.el7, openssh-keycat 7.4p1-11.el7, openssh-server 7.4p1-11.el7, openssh-askpass 7.4p1-11.el7, openssh-clients 7.4p1-11.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) openssh-cavs 7.4p1-11.el7, openssh-ldap 7.4p1-11.el7, pam_ssh_agent_auth 0.10.3-1.11.el7, openssh-server-sysvinit 7.4p1-11.el7
    fixed: vendor fix RHSA-2017:2029
  • Red Hat Enterprise Linux 8 openssh, openssh-cavs, openssh-ldap, openssh-keycat, openssh-server, openssh-askpass, +2 more
    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 SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

15.72% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

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.