CVE-2016-10708

HIGH

OpenSSH < 7.4 - Denial of Service via Out-of-Sequence NEWKEYS Message

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-10708. PoCs published by lggcs.

AI-analyzed exploit summary This repository contains a functional Python-based PoC for CVE-2016-10708, which exploits a DoS vulnerability in OpenSSH versions prior to 7.4 by flooding the server with crafted SSH_MSG_NEWKEYS packets. The script supports both scanning for vulnerable versions and launching a DoS attack.

Description

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.

Exploits (1)

nomisec WORKING POC
by lggcs · poc
https://github.com/lggcs/CVE-2016-10708

This repository contains a functional Python-based PoC for CVE-2016-10708, which exploits a DoS vulnerability in OpenSSH versions prior to 7.4 by flooding the server with crafted SSH_MSG_NEWKEYS packets. The script supports both scanning for vulnerable versions and launching a DoS attack.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: OpenSSH < 7.4
No auth needed
Prerequisites: Network access to target SSH server · Python 3.6+
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (11)

Core 11
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://www.openssh.com/releasenotes.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20180423-0003/
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/01/msg00031.html
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/3809-1/
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/102780
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
Patch, Third Party Advisory x_refsource_misc
http://blog.swiecki.net/2018/01/fuzzing-tcp-servers.html

Scores

CVSS v3 7.5
EPSS 0.1600
EPSS Percentile 96.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (15)
canonical/ubuntu_linux 14.04
canonical/ubuntu_linux 16.04
canonical/ubuntu_linux 18.04
debian/debian_linux 7.0
debian/debian_linux 8.0
netapp/cloud_backup
netapp/clustered_data_ontap
netapp/data_ontap
netapp/data_ontap_edge
netapp/oncommand_unified_manager 9.4
... and 5 more
Published Jan 21, 2018
Tracked Since Feb 18, 2026