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.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-578-1 openssh security update
Debian DSA Debian DSA DSA-3626-1 openssh security update
Ubuntu USN Ubuntu USN USN-3061-1 OpenSSH vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 29 May 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-29T20:17:40.496Z

Reserved: 2016-07-13T00:00:00.000Z

Link: CVE-2016-6210

cve-icon Vulnrichment

Updated: 2024-08-06T01:22:20.650Z

cve-icon NVD

Status : Modified

Published: 2017-02-13T17:59:00.153

Modified: 2026-05-29T21:16:29.743

Link: CVE-2016-6210

cve-icon Redhat

Severity : Moderate

Publid Date: 2016-07-14T00:00:00Z

Links: CVE-2016-6210 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses