CVE Database›CVE-2016-6210

CVE-2016-6210

openssh: User enumeration via covert timing channel

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Severity

Moderate

Red Hat Product Security

5.3

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 · 5.3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS 2.0 · 5
AV:N/AC:L/Au:N/C:P/I:N/A:N

CWE-385 · Covert Timing Channel