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
mitre CNA under the mitre root
CNA scorecard E 28/100 over 2325 records in the last 180 days details
References
Date Public
2016-10-10 00:00
Show details on NVD website
To clipboard 

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              "shortName": "CVE"
            },
            "references": [
              {
                "name": "93776",
                "tags": [
                  "vdb-entry",
                  "x_transferred"
                ],
                "url": "http://www.securityfocus.com/bid/93776"
              },
              {
                "name": "[oss-security] 20161020 Re: Re: CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH",
                "tags": [
                  "mailing-list",
                  "x_transferred"
                ],
                "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://security.netapp.com/advisory/ntap-20180201-0001/"
              },
              {
                "name": "[oss-security] 20161019 CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH",
                "tags": [
                  "mailing-list",
                  "x_transferred"
                ],
                "url": "http://www.openwall.com/lists/oss-security/2016/10/19/3"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126\u0026r2=1.127\u0026f=h"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig"
              },
              {
                "name": "FreeBSD-SA-16:33",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc"
              },
              {
                "name": "1037057",
                "tags": [
                  "vdb-entry",
                  "x_transferred"
                ],
                "url": "http://www.securitytracker.com/id/1037057"
              },
              {
                "name": "GLSA-201612-18",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://security.gentoo.org/glsa/201612-18"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1384860"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127\u0026content-type=text/x-cvsweb-markup"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "NETWORK",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.5,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2016-8858",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-04-15T16:36:39.938823Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-400",
                    "description": "CWE-400 Uncontrolled Resource Consumption",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-05-29T20:45:12.698Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "n/a",
              "vendor": "n/a",
              "versions": [
                {
                  "status": "affected",
                  "version": "n/a"
                }
              ]
            }
          ],
          "datePublic": "2016-10-10T00:00:00.000Z",
          "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": [
                {
                  "description": "n/a",
                  "lang": "en",
                  "type": "text"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2022-12-13T00:00:00.000Z",
            "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
            "shortName": "mitre"
          },
          "references": [
            {
              "name": "93776",
              "tags": [
                "vdb-entry"
              ],
              "url": "http://www.securityfocus.com/bid/93776"
            },
            {
              "name": "[oss-security] 20161020 Re: Re: CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH",
              "tags": [
                "mailing-list"
              ],
              "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
            },
            {
              "url": "https://security.netapp.com/advisory/ntap-20180201-0001/"
            },
            {
              "name": "[oss-security] 20161019 CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH",
              "tags": [
                "mailing-list"
              ],
              "url": "http://www.openwall.com/lists/oss-security/2016/10/19/3"
            },
            {
              "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"
            },
            {
              "name": "FreeBSD-SA-16:33",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc"
            },
            {
              "name": "1037057",
              "tags": [
                "vdb-entry"
              ],
              "url": "http://www.securitytracker.com/id/1037057"
            },
            {
              "name": "GLSA-201612-18",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.gentoo.org/glsa/201612-18"
            },
            {
              "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"
            }
          ],
          "tags": [
            "disputed"
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "assignerShortName": "mitre",
        "cveId": "CVE-2016-8858",
        "datePublished": "2016-12-09T00:00:00.000Z",
        "dateReserved": "2016-10-19T00:00:00.000Z",
        "dateUpdated": "2026-05-29T20:45:20.720Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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