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CVE-2021-36369

Fixed in a distro release EPSS 2%CVSS 7.5

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.

Published 2022-10-12 · CVE record · OSV

Products: dropbear_ssh_project dropbear_ssh, debian_linux

Distro releases

ReleasePackageFixed in
Debian 10dropbear2018.76-5+deb10u2
Debian 12dropbear2022.82-1
Debian 13dropbear2022.82-1
Debian 14dropbear2022.82-1
Ubuntu 16.04 LTSdropbearno fix
Ubuntu 22.04 LTSdropbear2020.81-5ubuntu0.1
Ubuntu Pro 18.04 LTSdropbear2017.75-3ubuntu0.1~esm1
Ubuntu Pro 20.04 LTSdropbear2019.78-2ubuntu0.1~esm1