Public Date:
1364935: CVE-2016-6515 openssh: Denial of service via very long passwords
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.

Find out more about CVE-2016-6515 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue in OpenSSH is mitigated by the usage of SELinux in Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

CVSS v2 metrics

Base Score 4.3
Base Metrics AV:N/AC:M/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

CVSS v3 metrics

CVSS3 Base Score 5.3
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact Low

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (openssh) RHSA-2017:2029 2017-08-01

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 openssh Will not fix
Red Hat Enterprise Linux 5 openssh Will not fix
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.
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