CVE-2016-6210

Exposure of Sensitive Information to an Unauthorized Actor

CVSS 3.1 Medium 5.9

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.

Key data

CVSS 3.1 Medium 5.9

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: None
No effect on the trustworthiness of data.
Availability impact: None
No effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	High	The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required	None	No account or privileges are needed.
User interaction	None	No action from any user is needed.
Scope	Unchanged	The impact stays within the vulnerable component.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	None	No effect on the trustworthiness of data.
Availability impact	None	No effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.88944 (88.9% probability)
Percentile: 99.8%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA assessment as of May 29, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Public proof of concept recorded by CISA
Automatable: no
Technical impact: partial

Weakness (CWE)

CWE catalog version 5.0.

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

RHSA-2017:2563 (access.redhat.com)vendor-advisory
1036319 (securitytracker.com)vdb-entry
20160714 opensshd - user enumeration (seclists.org)mailing-list
DSA-3626 (debian.org)vendor-advisory
40136 (exploit-db.com)exploit
40113 (exploit-db.com)exploit
openssh.com/txt/release-7.3
GLSA-201612-18 (security.gentoo.org)vendor-advisory
RHSA-2017:2029 (access.redhat.com)vendor-advisory
91812 (securityfocus.com)vdb-entry
security.netapp.com/advisory/ntap-20190206-0001
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Timeline

ID reservedJul 13, 2016
Record publishedFeb 13, 2017
Record last updatedMay 29, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:46 UTC. Sources and licenses