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CVE-2016-6210 (GCVE-0-2016-6210)

Vulnerability from cvelistv5 – Published: 2017-02-13 00:00 – Updated: 2026-05-29 20:17
VLAI
Summary
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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-29 20:17 UTC
CWE
  • n/a
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Date Public
2016-07-14 00:00
Show details on NVD website
To clipboard 

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      "id": "CVE-2016-6210",
      "initial_release_date": "2023-02-15T04:59:49Z",
      "product_status:known_affected": "322",
      "product_status:known_not_affected": "47",
      "product_status:recommended": "517",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2016-6210",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-6210.json",
      "version": "48"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2017:2563\", \"name\": \"RHSA-2017:2563\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"http://www.securitytracker.com/id/1036319\", \"name\": \"1036319\", \"tags\": [\"vdb-entry\", \"x_transferred\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2016/Jul/51\", \"name\": \"20160714 opensshd - user enumeration\", \"tags\": [\"mailing-list\", \"x_transferred\"]}, {\"url\": \"http://www.debian.org/security/2016/dsa-3626\", \"name\": \"DSA-3626\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://www.exploit-db.com/exploits/40136/\", \"name\": \"40136\", \"tags\": [\"exploit\", \"x_transferred\"]}, {\"url\": \"https://www.exploit-db.com/exploits/40113/\", \"name\": \"40113\", \"tags\": [\"exploit\", \"x_transferred\"]}, {\"url\": \"https://www.openssh.com/txt/release-7.3\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/201612-18\", \"name\": \"GLSA-201612-18\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2017:2029\", \"name\": \"RHSA-2017:2029\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"http://www.securityfocus.com/bid/91812\", \"name\": \"91812\", \"tags\": [\"vdb-entry\", \"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190206-0001/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-06T01:22:20.650Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2016-6210\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-29T20:17:34.559558Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-200\", \"description\": \"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-29T20:17:31.137Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"datePublic\": \"2016-07-14T00:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2017:2563\", \"name\": \"RHSA-2017:2563\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://www.securitytracker.com/id/1036319\", \"name\": \"1036319\", \"tags\": [\"vdb-entry\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2016/Jul/51\", \"name\": \"20160714 opensshd - user enumeration\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://www.debian.org/security/2016/dsa-3626\", \"name\": \"DSA-3626\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.exploit-db.com/exploits/40136/\", \"name\": \"40136\", \"tags\": [\"exploit\"]}, {\"url\": \"https://www.exploit-db.com/exploits/40113/\", \"name\": \"40113\", \"tags\": [\"exploit\"]}, {\"url\": \"https://www.openssh.com/txt/release-7.3\"}, {\"url\": \"https://security.gentoo.org/glsa/201612-18\", \"name\": \"GLSA-201612-18\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2017:2029\", \"name\": \"RHSA-2017:2029\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://www.securityfocus.com/bid/91812\", \"name\": \"91812\", \"tags\": [\"vdb-entry\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190206-0001/\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2022-12-13T00:00:00.000Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2016-6210\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-29T20:17:40.496Z\", \"dateReserved\": \"2016-07-13T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2017-02-13T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.