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)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2017:2563 | vendor-advisory |
| http://www.securitytracker.com/id/1036319 | vdb-entry |
| http://seclists.org/fulldisclosure/2016/Jul/51 | mailing-list |
| http://www.debian.org/security/2016/dsa-3626 | vendor-advisory |
| https://www.exploit-db.com/exploits/40136/ | exploit |
| https://www.exploit-db.com/exploits/40113/ | exploit |
| https://www.openssh.com/txt/release-7.3 | |
| https://security.gentoo.org/glsa/201612-18 | vendor-advisory |
| https://access.redhat.com/errata/RHSA-2017:2029 | vendor-advisory |
| http://www.securityfocus.com/bid/91812 | vdb-entry |
| https://security.netapp.com/advisory/ntap-2019020… | |
| https://cert-portal.siemens.com/productcert/pdf/s… |
Date Public
2016-07-14 00:00
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Notes\",\"Vendor Advisory\"]}]}}",
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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