CVE-2023-1667

Publication date 9 May 2023

Last updated 18 August 2025

Ubuntu priority

Cvss 3 Severity Score

A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libssh	25.04 plucky	Fixed 0.10.5-2
	24.10 oracular	Fixed 0.10.5-2
	24.04 LTS noble	Fixed 0.10.5-2
	23.10 mantic	Fixed 0.10.5-2
	23.04 lunar	Fixed 0.10.4-2ubuntu0.1
	22.10 kinetic	Fixed 0.9.6-2ubuntu0.22.10.1
	22.04 LTS jammy	Fixed 0.9.6-2ubuntu0.22.04.1
	20.04 LTS focal	Fixed 0.9.3-2ubuntu2.3
	18.04 LTS bionic	Ignored changes too intrusive
	16.04 LTS xenial	Ignored backporting risks regressions
	14.04 LTS trusty	Ignored end of standard support

Patch details

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

Package	Patch details
libssh	Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab Upstream: ?h=stab

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-6138-1
libssh vulnerabilities
5 June 2023