CVE-2016-6515

openssh: Denial of service via very long passwords

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.0

Review impact separately from score.

Published · July 21, 2016

Updated · November 21, 2025

Description

It was found that OpenSSH did not limit password lengths for password authentication. A remote unauthenticated attacker could use this flaw to temporarily trigger high CPU consumption in sshd by sending long passwords.

Statement

This issue in OpenSSH is mitigated by the usage of SELinux in Red Hat Enterprise Linux 6, 7 and 8. More details available at: https://bugzilla.redhat.com/show_bug.cgi?id=1364935#c13

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:N/I:N/A:L

CVSS 2.0 · 4.3
AV:N/AC:M/Au:N/C:N/I:N/A:P

CWE-770 · Allocation of Resources Without Limits or Throttling