CVE-2016-6210

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Summary

CVECVE-2016-6210
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-02-13 17:59:00 UTC
Updated2026-05-29 21:16:29 UTC
Descriptionsshd 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from ADP

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

EPSS: 0.900460000 probability, percentile 0.996000000 (date 2026-06-01)

Problem Types: CWE-200 | n/a | CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.0[email protected]Primary5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:M/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openbsd Openssh All p2 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Full Disclosure: opensshd - user enumeration af854a3a-2127-422b-91ae-364da2661108 seclists.org Mailing List, Third Party Advisory
OpenSSH CVE-2016-6210 User Enumeration Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
OpenSSHd 7.2p2 - Username Enumeration (PoC) af854a3a-2127-422b-91ae-364da2661108 www.exploit-db.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Debian -- Security Information -- DSA-3626-1 openssh af854a3a-2127-422b-91ae-364da2661108 www.debian.org
Exploit – Page 40136 – Exploits Database af854a3a-2127-422b-91ae-364da2661108 www.exploit-db.com
CVE-2016-6210 OpenSSH Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
www.openssh.com/txt/release-7.3 af854a3a-2127-422b-91ae-364da2661108 www.openssh.com Release Notes, Vendor Advisory
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com
OpenSSH: Multiple vulnerabilities (GLSA 201612-18) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
OpenSSH Lets Remote Users Determine Valid Usernames on the Target System - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 160867 Oracle Enterprise Linux Security Update for openssh (ELSA-2023-4428)
  • 38907 OpenSSH User Enumeration Vulnerability (CVE-2016-6210)
  • 390278 Oracle Managed Virtualization (VM) Server for x86 Security Update for openssh (OVMSA-2023-0019)
  • 591280 Siemens SCALANCE X-200RNA Switch Devices Denial of Service (DoS) Multiple Vulnerabilities (ICSA-22-349-21, SSA-412672)
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