CVE-2016-10708

Publication date 21 January 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openssh	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Not affected
	16.04 LTS xenial	Fixed 1:7.2p2-4ubuntu2.6
	14.04 LTS trusty	Fixed 1:6.6p1-2ubuntu2.11

Notes

mdeslaur

rated low as issue only allows crashing the per-connection process, not the main daemon.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openssh	Upstream: ?id=286

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-3809-1
OpenSSH vulnerabilities
6 November 2018