Vulnerability-Lookup

CVE-2016-6515 (GCVE-0-2016-6515)

Vulnerability from cvelistv5 – Published: 2016-08-07 00:00 – Updated: 2024-08-06 01:29

Summary

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.

Severity

7.5 (High)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

Assigner

mitre mitre root

References

15 references

URL	Tags
https://support.hpe.com/hpsc/doc/public/display?d…
https://security.netapp.com/advisory/ntap-2017113…
https://github.com/openssh/openssh-portable/commi…
http://packetstormsecurity.com/files/140070/OpenS…
https://www.exploit-db.com/exploits/40888/	exploit
http://www.securityfocus.com/bid/92212	vdb-entry
https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisory
http://www.oracle.com/technetwork/security-adviso…
http://www.securitytracker.com/id/1036487	vdb-entry
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://access.redhat.com/errata/RHSA-2017:2029	vendor-advisory
https://lists.debian.org/debian-lts-announce/2018…	mailing-list
http://openwall.com/lists/oss-security/2016/08/01/2	mailing-list
https://cert-portal.siemens.com/productcert/pdf/s…
https://cert-portal.siemens.com/productcert/pdf/s…

Date Public

2016-08-01 00:00

Show details on NVD website

JSON

To clipboard

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      "product_status:fixed": "456",
      "product_status:known_affected": "8",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssh: Denial of service via very long passwords",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-6515.json",
      "version": "3"
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}

RHSA-2017:2029

Vulnerability from csaf_redhat - Published: 2017-08-01 14:11 - Updated: 2026-06-25 10:50

Summary

Red Hat Security Advisory: openssh security, bug fix, and enhancement update

Severity

Moderate

Scope

6 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

It was found that OpenSSH did not limit password lengths for password authentication. A remote unauthenticated attacker could use this flaw to temporarily trigger high CPU consumption in sshd by sending long passwords.

5.3 (Medium)


                
                  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 104 products

https://access.redhat.com/errata/RHSA-2017:2029

Open the full advisory

SSA-412672

Vulnerability from csaf_siemens - Published: 2022-12-13 00:00 - Updated: 2022-12-13 00:00

Summary

SSA-412672: Multiple OpenSSL and OpenSSH Vulnerabilities in SCALANCE X-200RNA Switch Devices before V3.2.7

Scope

83 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109814809/

Open the full advisory

SSA-676336

Vulnerability from csaf_siemens - Published: 2021-09-14 00:00 - Updated: 2023-04-11 00:00

Summary

SSA-676336: OpenSSH Vulnerabilities in SCALANCE X-200 and X-300/X408 Switches

Scope

3 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 104 products

https://support.industry.siemens.com/cs/ww/en/view/109817790/ https://support.industry.siemens.com/cs/ww/en/view/109801131/ https://support.industry.siemens.com/cs/ww/en/view/109808359/

Open the full advisory

SUSE-SU-2016:2280-1

Vulnerability from csaf_suse - Published: 2016-09-09 13:40 - Updated: 2016-09-09 13:40

Summary

Security update for openssh

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

7.5 (High)


                
                  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 43 products

Open the full advisory

SUSE-SU-2016:2281-1

Vulnerability from csaf_suse - Published: 2016-09-09 13:41 - Updated: 2016-09-09 13:41

Summary

Security update for openssh

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

7.5 (High)


                
                  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 40 products

Open the full advisory

SUSE-SU-2016:2388-1

Vulnerability from csaf_suse - Published: 2016-09-26 15:11 - Updated: 2016-09-26 15:11

Summary

Security update for openssh

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

7.5 (High)


                
                  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 33 products

Open the full advisory

SUSE-SU-2016:2555-1

Vulnerability from csaf_suse - Published: 2016-10-17 14:52 - Updated: 2016-10-17 14:52

Summary

Security update for openssh-openssl1

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

7.5 (High)


                
                  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 10 products

Open the full advisory

UBUNTU-CVE-2016-6515 (CVE-2016-6515)

Vulnerability from osv_ubuntu – Published: 2016-08-07 00:00 – Updated: 2025-09-08 16:43 – Source website

Details

Severity

7.5 (High)


                    
                      CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2016-6515	REPORT
	http://openwall.com/lists/oss-security/2016/08/01/2	REPORT
	https://ubuntu.com/security/notices/USN-3061-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2016-6515	REPORT

JSON

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{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:6.6p1-2ubuntu2.8"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:6.6p1-2ubuntu2.8"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:6.6p1-2ubuntu2.8"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:6.6p1-2ubuntu2.8"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:6.6p1-2ubuntu2.8"
          },
          {
            "binary_name": "ssh-krb5",
            "binary_version": "1:6.6p1-2ubuntu2.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.8?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:6.6p1-2ubuntu2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.2p2-6",
        "1:6.2p2-6ubuntu1",
        "1:6.4p1-1",
        "1:6.4p1-2",
        "1:6.5p1-1",
        "1:6.5p1-2",
        "1:6.5p1-3",
        "1:6.5p1-4",
        "1:6.5p1-6",
        "1:6.6p1-1",
        "1:6.6p1-2",
        "1:6.6p1-2ubuntu1",
        "1:6.6p1-2ubuntu2",
        "1:6.6p1-2ubuntu2.2",
        "1:6.6p1-2ubuntu2.3",
        "1:6.6p1-2ubuntu2.4",
        "1:6.6p1-2ubuntu2.6",
        "1:6.6p1-2ubuntu2.7"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          },
          {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          },
          {
            "binary_name": "ssh-krb5",
            "binary_version": "1:7.2p2-4ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:7.2p2-4ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.9p1-2",
        "1:6.9p1-3",
        "1:7.1p1-1",
        "1:7.1p1-3",
        "1:7.1p1-4",
        "1:7.1p1-6",
        "1:7.1p2-1",
        "1:7.1p2-2",
        "1:7.2p1-1",
        "1:7.2p2-1",
        "1:7.2p2-2",
        "1:7.2p2-3",
        "1:7.2p2-4",
        "1:7.2p2-4ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.",
  "id": "UBUNTU-CVE-2016-6515",
  "modified": "2025-09-08T16:43:49Z",
  "published": "2016-08-07T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-6515"
    },
    {
      "type": "REPORT",
      "url": "http://openwall.com/lists/oss-security/2016/08/01/2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3061-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2016-6515"
    }
  ],
  "related": [
    "USN-3061-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2016-6515"
  ]
}

WID-SEC-W-2023-0449

Vulnerability from csaf_certbund - Published: 2016-08-01 22:00 - Updated: 2024-05-07 22:00

Summary

OpenSSH: Mehrere Schwachstellen

Severity

Mittel

Scope

2 vulnerabilities in this advisory, including CVE-2016-6515.

CVE-2016-6515

Es existiert eine Schwachstelle in OpenSSH. Ein Angreifer kann durch Eingabe eines überlangen Passworts einen Denial of Service Zustand herbeiführen.

Known affected: 17 products

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2016-6515 (GCVE-0-2016-6515)

UBUNTU-CVE-2016-6515 (CVE-2016-6515)

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Related by attack behaviour