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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 · CISA-ADP (v2.0.3)
Decision recorded 2024-04-15 16:36 UTC
CWE
  • n/a
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Date Public
2016-10-10 00:00
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-05-29T21:09:49+00:00",
      "cve": "CVE-2016-8858",
      "id": "CVE-2016-8858",
      "initial_release_date": "2016-10-17T00:00:00+00:00",
      "product_status:known_not_affected": "18",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssh: Memory exhaustion due to unregistered KEXINIT handler after receiving message",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-8858.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-08-27T01:38:48Z",
      "cve": "CVE-2016-8858",
      "id": "CVE-2016-8858",
      "initial_release_date": "2023-02-15T04:56:33Z",
      "product_status:known_affected": "339",
      "product_status:recommended": "519",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2016-8858",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-8858.json",
      "version": "43"
    },
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      "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.


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.