CVE-2016-6210
openssh: User enumeration via covert timing channel
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · July 14, 2016
Updated · May 30, 2026
Description
A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses.
Statement
This issue in OpenSSH is mitigated by the usage of SELinux in Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.
CVSS score applicability
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.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0 · 5AV:N/AC:L/Au:N/C:P/I:N/A:N
CWE-385 · Covert Timing Channel