Vulnerability-Lookup

OESA-2021-1120 (CVE-2020-14145)

Vulnerability from osv_openeuler – Published: 2021-04-07 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

openssh security update

Details

OpenSSH is the premier connectivity tool for remote login with the SSH protocol. It encrypts all traffic to eliminate eavesdropping, connection hijacking, and other attacks. In addition, OpenSSH provides a large suite of secure tunneling capabilities, several authentication methods, and sophisticated configuration options.

Security Fix(es):

The client side in OpenSSH 5.7 through 8.3 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).(CVE-2020-14145)

Severity

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-14145	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "openssh-clients-8.2p1-9.oe1.aarch64.rpm",
          "openssh-cavs-8.2p1-9.oe1.aarch64.rpm",
          "openssh-keycat-8.2p1-9.oe1.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.9.oe1.aarch64.rpm",
          "openssh-askpass-8.2p1-9.oe1.aarch64.rpm",
          "openssh-debuginfo-8.2p1-9.oe1.aarch64.rpm",
          "openssh-debugsource-8.2p1-9.oe1.aarch64.rpm",
          "openssh-server-8.2p1-9.oe1.aarch64.rpm",
          "openssh-8.2p1-9.oe1.aarch64.rpm",
          "openssh-ldap-8.2p1-9.oe1.aarch64.rpm",
          "openssh-clients-8.2p1-10.oe1.aarch64.rpm",
          "openssh-cavs-8.2p1-10.oe1.aarch64.rpm",
          "openssh-keycat-8.2p1-10.oe1.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.9.oe1.aarch64.rpm",
          "openssh-askpass-8.2p1-10.oe1.aarch64.rpm",
          "openssh-debuginfo-8.2p1-10.oe1.aarch64.rpm",
          "openssh-debugsource-8.2p1-10.oe1.aarch64.rpm",
          "openssh-server-8.2p1-10.oe1.aarch64.rpm",
          "openssh-8.2p1-10.oe1.aarch64.rpm",
          "openssh-ldap-8.2p1-10.oe1.aarch64.rpm"
        ],
        "noarch": [
          "openssh-help-8.2p1-9.oe1.noarch.rpm",
          "openssh-help-8.2p1-10.oe1.noarch.rpm"
        ],
        "src": [
          "openssh-8.2p1-9.oe1.src.rpm",
          "openssh-8.2p1-10.oe1.src.rpm"
        ],
        "x86_64": [
          "openssh-cavs-8.2p1-9.oe1.x86_64.rpm",
          "openssh-clients-8.2p1-9.oe1.x86_64.rpm",
          "openssh-debuginfo-8.2p1-9.oe1.x86_64.rpm",
          "openssh-debugsource-8.2p1-9.oe1.x86_64.rpm",
          "openssh-server-8.2p1-9.oe1.x86_64.rpm",
          "openssh-ldap-8.2p1-9.oe1.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.9.oe1.x86_64.rpm",
          "openssh-8.2p1-9.oe1.x86_64.rpm",
          "openssh-askpass-8.2p1-9.oe1.x86_64.rpm",
          "openssh-keycat-8.2p1-9.oe1.x86_64.rpm",
          "openssh-cavs-8.2p1-10.oe1.x86_64.rpm",
          "openssh-clients-8.2p1-10.oe1.x86_64.rpm",
          "openssh-debuginfo-8.2p1-10.oe1.x86_64.rpm",
          "openssh-debugsource-8.2p1-10.oe1.x86_64.rpm",
          "openssh-server-8.2p1-10.oe1.x86_64.rpm",
          "openssh-ldap-8.2p1-10.oe1.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.9.oe1.x86_64.rpm",
          "openssh-8.2p1-10.oe1.x86_64.rpm",
          "openssh-askpass-8.2p1-10.oe1.x86_64.rpm",
          "openssh-keycat-8.2p1-10.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-20.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2p1-10.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "openssh-clients-8.2p1-10.oe1.aarch64.rpm",
          "openssh-cavs-8.2p1-10.oe1.aarch64.rpm",
          "openssh-keycat-8.2p1-10.oe1.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.9.oe1.aarch64.rpm",
          "openssh-askpass-8.2p1-10.oe1.aarch64.rpm",
          "openssh-debuginfo-8.2p1-10.oe1.aarch64.rpm",
          "openssh-debugsource-8.2p1-10.oe1.aarch64.rpm",
          "openssh-server-8.2p1-10.oe1.aarch64.rpm",
          "openssh-8.2p1-10.oe1.aarch64.rpm",
          "openssh-ldap-8.2p1-10.oe1.aarch64.rpm"
        ],
        "noarch": [
          "openssh-help-8.2p1-10.oe1.noarch.rpm"
        ],
        "src": [
          "openssh-8.2p1-10.oe1.src.rpm"
        ],
        "x86_64": [
          "openssh-cavs-8.2p1-10.oe1.x86_64.rpm",
          "openssh-clients-8.2p1-10.oe1.x86_64.rpm",
          "openssh-debuginfo-8.2p1-10.oe1.x86_64.rpm",
          "openssh-debugsource-8.2p1-10.oe1.x86_64.rpm",
          "openssh-server-8.2p1-10.oe1.x86_64.rpm",
          "openssh-ldap-8.2p1-10.oe1.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.9.oe1.x86_64.rpm",
          "openssh-8.2p1-10.oe1.x86_64.rpm",
          "openssh-askpass-8.2p1-10.oe1.x86_64.rpm",
          "openssh-keycat-8.2p1-10.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2p1-10.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "OpenSSH is the premier connectivity tool for remote login with the SSH protocol. It encrypts all traffic to eliminate eavesdropping, connection hijacking, and other attacks. In addition, OpenSSH provides a large suite of secure tunneling capabilities, several authentication methods, and sophisticated configuration options.\r\n\r\nSecurity Fix(es):\r\n\r\nThe client side in OpenSSH 5.7 through 8.3 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).(CVE-2020-14145)",
  "id": "OESA-2021-1120",
  "modified": "2026-08-06T11:04:21Z",
  "published": "2021-04-07T11:04:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1120"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14145"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "openssh security update",
  "upstream": [
    "CVE-2020-14145"
  ]
}

CVE-2020-14145 (GCVE-0-2020-14145)

Vulnerability from cvelistv5 – Published: 2020-06-29 17:33 – Updated: 2025-12-18 14:41

Summary

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-18 14:41 UTC

CWE

n/a
CWE-203 - Observable Discrepancy

Assigner

mitre mitre root

References

8 references

URL	Tags
https://github.com/openssh/openssh-portable/compa…	x_refsource_MISC
https://www.fzi.de/en/news/news/detail-en/artikel…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020070…	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2020/12/02/1	mailing-listx_refsource_MLIST
https://anongit.mindrot.org/openssh.git/commit/?i…	x_refsource_MISC
https://docs.ssh-mitm.at/CVE-2020-14145.html	x_refsource_MISC
https://github.com/ssh-mitm/ssh-mitm/blob/master/…	x_refsource_MISC
https://security.gentoo.org/glsa/202105-35	vendor-advisoryx_refsource_GENTOO

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T12:39:36.101Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200709-0004/"
          },
          {
            "name": "[oss-security] 20201202 Some mitigation for openssh CVE-2020-14145",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2020/12/02/1"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://docs.ssh-mitm.at/CVE-2020-14145.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py"
          },
          {
            "name": "GLSA-202105-35",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202105-35"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.9,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2020-14145",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-18T14:41:29.925446Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-203",
                "description": "CWE-203 Observable Discrepancy",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-18T14:41:37.776Z",
          "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"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-05-26T13:06:15.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://security.netapp.com/advisory/ntap-20200709-0004/"
        },
        {
          "name": "[oss-security] 20201202 Some mitigation for openssh CVE-2020-14145",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2020/12/02/1"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://docs.ssh-mitm.at/CVE-2020-14145.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py"
        },
        {
          "name": "GLSA-202105-35",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202105-35"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2020-14145",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1",
              "refsource": "MISC",
              "url": "https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1"
            },
            {
              "name": "https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/",
              "refsource": "MISC",
              "url": "https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20200709-0004/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20200709-0004/"
            },
            {
              "name": "[oss-security] 20201202 Some mitigation for openssh CVE-2020-14145",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2020/12/02/1"
            },
            {
              "name": "https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d",
              "refsource": "MISC",
              "url": "https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d"
            },
            {
              "name": "https://docs.ssh-mitm.at/CVE-2020-14145.html",
              "refsource": "MISC",
              "url": "https://docs.ssh-mitm.at/CVE-2020-14145.html"
            },
            {
              "name": "https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py",
              "refsource": "MISC",
              "url": "https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py"
            },
            {
              "name": "GLSA-202105-35",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202105-35"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2020-14145",
    "datePublished": "2020-06-29T17:33:36.000Z",
    "dateReserved": "2020-06-15T00:00:00.000Z",
    "dateUpdated": "2025-12-18T14:41:37.776Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

OESA-2021-1120 (CVE-2020-14145)

CVE-2020-14145 (GCVE-0-2020-14145)

Tags

Sightings

Nomenclature

Related by attack behaviour