Vulnerability Description
VyOS 1.3 through 1.5 (fixed in 1.4.2) or any Debian-based system using dropbear in combination with live-build has the same Dropbear private host keys across different installations. Thus, an attacker can conduct active man-in-the-middle attacks against SSH connections if Dropbear is enabled as the SSH daemon. I n VyOS, this is not the default configuration for the system SSH daemon, but is for the console service. To mitigate this, one can run "rm -f /etc/dropbear/*key*" and/or "rm -f /etc/dropbear-initramfs/*key*" and then dropbearkey -t rsa -s 4096 -f /etc/dropbear_rsa_host_key and reload the service or reboot the system before using Dropbear as the SSH daemon (this clears out all keys mistakenly built into the release image) or update to the latest version of VyOS 1.4 or 1.5. Note that this vulnerability is not unique to VyOS and may appear in any Debian-based Linux distribution that uses Dropbear in combination with live-build, which has a safeguard against this behavior in OpenSSH but no equivalent one for Dropbear.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://blog.vyos.io/vyos-project-march-2025-update
- https://blog.vyos.io/vyos-stream-1.5-2025-q1
- https://github.com/vyos/
- https://vyos.dev/T7217
- https://vyos.net/get/stream/#1.5-2025-Q1
FAQ
What is CVE-2025-30095?
CVE-2025-30095 is a vulnerability with a CVSS score of 9.0 (CRITICAL). VyOS 1.3 through 1.5 (fixed in 1.4.2) or any Debian-based system using dropbear in combination with live-build has the same Dropbear private host keys across different installations. Thus, an attacker...
How severe is CVE-2025-30095?
CVE-2025-30095 has been rated CRITICAL with a CVSS base score of 9.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-30095?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.