What is the severity of CVE-2021-36369?

CVE-2021-36369 is considered to have a medium severity due to its potential to bypass authentication in SSH sessions.

How do I fix CVE-2021-36369?

To mitigate CVE-2021-36369, update Dropbear SSH to version 2022.82 or later.

Which versions of Dropbear SSH are affected by CVE-2021-36369?

Dropbear SSH versions up to and including 2020.81 are affected by CVE-2021-36369.

What kind of systems are impacted by CVE-2021-36369?

CVE-2021-36369 affects systems using Dropbear SSH, particularly versions prior to 2022.82 and Debian GNU/Linux version 10.0.

What does CVE-2021-36369 exploit in Dropbear SSH?

CVE-2021-36369 exploits a non-RFC-compliant validation of authentication methods in the client-side SSH code.

Vulnerability/
CVE-2021-36369

high

7.5

CWE

287

12/10/2022

4/8/2024

CVE-2021-36369

First published: Wed Oct 12 2022(Updated: )

An issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Dropbear SSH	<=2020.81
Debian GNU/Linux	=10.0

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Frequently Asked Questions

What is the severity of CVE-2021-36369?
CVE-2021-36369 is considered to have a medium severity due to its potential to bypass authentication in SSH sessions.
How do I fix CVE-2021-36369?
To mitigate CVE-2021-36369, update Dropbear SSH to version 2022.82 or later.
Which versions of Dropbear SSH are affected by CVE-2021-36369?
Dropbear SSH versions up to and including 2020.81 are affected by CVE-2021-36369.
What kind of systems are impacted by CVE-2021-36369?
CVE-2021-36369 affects systems using Dropbear SSH, particularly versions prior to 2022.82 and Debian GNU/Linux version 10.0.
What does CVE-2021-36369 exploit in Dropbear SSH?
CVE-2021-36369 exploits a non-RFC-compliant validation of authentication methods in the client-side SSH code.

agent/references
agent/type
collector/mitre-cve
source/MITRE
agent/author
agent/severity
agent/weakness
agent/last-modified-date
agent/description
agent/first-publish-date
agent/event
agent/source
agent/tags
agent/softwarecombine
collector/nvd-index
agent/software-canonical-lookup-request
vendor/dropbear ssh project
canonical/dropbear ssh
version/dropbear ssh/2020.81
vendor/debian
canonical/debian gnu/linux
version/debian gnu/linux/10.0

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