CVE-2021-36369
dropbear - security update
7.5
HIGH
CVSS 3.1
EPSS 0.21%
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.
How to fix CVE-2021-36369
To remediate CVE-2021-36369, upgrade the affected package to a fixed version below.
- —upgrade to 2020.81-3+deb11u1 or later
- —upgrade to 2018.76-5+deb10u2 or later
Is CVE-2021-36369 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2020.81-3+deb11u1
- from 0, < 2018.76-5+deb10u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |