CVE-2016-20012

OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product

Although a CVE was assigned upstream and Red Hat doesn't consider it to be a security flaw and won't receive any patch, also the CVE was made as disputed by MITRE. Considering that Red Hat is closing this flaw as NOTABUG.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.