Bug 2060960 (CVE-2022-21716) - CVE-2022-21716 python-twisted: SSH client and server denial of service during SSH handshake
Summary: CVE-2022-21716 python-twisted: SSH client and server denial of service during...
Alias: CVE-2022-21716
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2060973 2060972 2061094 2061095 2061096 2061097 2061456 2061457 2062134 2062135
Blocks: 2060958
TreeView+ depends on / blocked
Reported: 2022-03-04 17:14 UTC by Mauro Matteo Cascella
Modified: 2022-07-07 11:59 UTC (History)
46 users (show)

Fixed In Version: python-twisted 22.2.0
Doc Type: If docs needed, set a value
Doc Text:
An uncontrolled resource consumption flaw was found in python-twisted in the dataReceived() function. This flaw allows an unauthenticated, remote attacker to send a simple command to use all available memory and crash the server.
Clone Of:
Last Closed: 2022-03-24 14:02:48 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:0982 0 None None None 2022-03-24 11:04:20 UTC
Red Hat Product Errata RHSA-2022:0992 0 None None None 2022-03-23 22:29:27 UTC

Description Mauro Matteo Cascella 2022-03-04 17:14:50 UTC
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 22.2.0, the Twisted SSH client and server implementation naively accepted an infinite amount of data for the peer's SSH version identifier. A malicious peer can trivially craft a request that uses all available memory and crash the server, resulting in denial of service.


Upstream commit:

Comment 1 Mauro Matteo Cascella 2022-03-04 18:19:10 UTC
Created python-twisted tracking bugs for this issue:

Affects: epel-all [bug 2060973]
Affects: fedora-all [bug 2060972]

Comment 4 Lon Hohberger 2022-03-08 21:11:01 UTC
Corrected upstream commit:


Comment 6 errata-xmlrpc 2022-03-23 22:29:24 UTC
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 16.2

Via RHSA-2022:0992 https://access.redhat.com/errata/RHSA-2022:0992

Comment 7 errata-xmlrpc 2022-03-24 11:04:17 UTC
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 16.1

Via RHSA-2022:0982 https://access.redhat.com/errata/RHSA-2022:0982

Comment 8 Product Security DevOps Team 2022-03-24 14:02:45 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


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