CVE-2016-8858 (GCVE-0-2016-8858)

Vulnerability from cvelistv5 – Published: 2016-12-09 00:00 – Updated: 2026-05-29 20:45 Disputed
VLAI
Summary
The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • n/a
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Date Public
2016-10-10 00:00
Show details on NVD website
To clipboard 

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\"2024-04-15T16:36:39.938823Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-29T20:45:12.698Z\"}}], \"cna\": {\"tags\": [\"disputed\"], \"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"datePublic\": \"2016-10-10T00:00:00.000Z\", \"references\": [{\"url\": \"http://www.securityfocus.com/bid/93776\", \"name\": \"93776\", \"tags\": [\"vdb-entry\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2016/10/20/1\", \"name\": \"[oss-security] 20161020 Re: Re: CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20180201-0001/\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2016/10/19/3\", \"name\": \"[oss-security] 20161019 CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126\u0026r2=1.127\u0026f=h\"}, {\"url\": \"https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad\"}, {\"url\": \"https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig\"}, {\"url\": \"https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc\", \"name\": \"FreeBSD-SA-16:33\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://www.securitytracker.com/id/1037057\", \"name\": \"1037057\", \"tags\": [\"vdb-entry\"]}, {\"url\": \"https://security.gentoo.org/glsa/201612-18\", \"name\": \"GLSA-201612-18\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=1384860\"}, {\"url\": \"http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127\u0026content-type=text/x-cvsweb-markup\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests.  NOTE: a third party reports that \\\"OpenSSH upstream does not consider this as a security issue.\\\"\"}], \"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-2016-8858\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-29T20:45:20.720Z\", \"dateReserved\": \"2016-10-19T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2016-12-09T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





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.