A vulnerability was found in libssh's server-side state machine before versions 0.7.6 and 0.8.4. A malicious client could create channels without first performing authentication, resulting in unauthorized access.
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
https://www.debian.org/security/2018/dsa-4322
https://usn.ubuntu.com/3795-2/
https://usn.ubuntu.com/3795-1/
https://security.netapp.com/advisory/ntap-20190118-0002/
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0016
https://lists.debian.org/debian-lts-announce/2018/10/msg00010.html