High severity7.5NVD Advisory· Published Oct 12, 2022· Updated Jun 17, 2026
CVE-2021-36369
CVE-2021-36369
Description
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.
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Affected products
2- Dropbear/Dropbeardescription
- Range: <=2020.81
Patches
Vulnerability mechanics
References
4- github.com/mkj/dropbear/pull/128nvdThird Party Advisory
- github.com/mkj/dropbear/releasesnvdRelease NotesThird Party Advisory
- github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82nvdRelease NotesThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/11/msg00015.htmlnvdMailing ListThird Party Advisory
News mentions
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