CVE-2022-21716

Publication date 3 March 2022

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 22.2.0, Twisted SSH client and server implement is able to accept an infinite amount of data for the peer's SSH version identifier. This ends up with a buffer using all the available memory. The attach is a simple as `nc -rv localhost 22 < /dev/zero`. A patch is available in version 22.2.0. There are currently no known workarounds.

Status

Package Ubuntu Release Status
twisted 22.04 LTS jammy
Fixed 22.1.0-2ubuntu2.1
21.10 impish
Fixed 20.3.0-7ubuntu1.1
20.04 LTS focal
Fixed 18.9.0-11ubuntu0.20.04.2
18.04 LTS bionic
Fixed 17.9.0-2ubuntu0.3
16.04 LTS xenial
14.04 LTS trusty

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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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H