Vulnerability-Lookup

FKIE_CVE-2020-1666

Vulnerability from fkie_nvd - Published: 2020-10-16 21:15 - Updated: 2026-06-17 03:02

Severity

6.6 (Medium) - CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

The system console configuration option 'log-out-on-disconnect' In Juniper Networks Junos OS Evolved fails to log out an active CLI session when the console cable is disconnected. This could allow a malicious attacker with physical access to the console the ability to resume a previous interactive session and possibly gain administrative privileges. This issue affects all Juniper Networks Junos OS Evolved versions after 18.4R1-EVO, prior to 20.2R1-EVO.

References

	URL	Tags
	sirt@juniper.net	https://kb.juniper.net/JSA11063	Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://kb.juniper.net/JSA11063	Vendor Advisory

Impacted products

Vendor	Product	Version
juniper	junos_os_evolved	19.2
juniper	junos_os_evolved	19.2
juniper	junos_os_evolved	19.3
juniper	junos_os_evolved	19.4
juniper	junos_os_evolved	19.4
juniper	junos_os_evolved	19.4
juniper	junos_os_evolved	20.1

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Junos OS Evolved",
          "vendor": "Juniper Networks",
          "versions": [
            {
              "lessThan": "20.2R1-EVO",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "18.4R1-EVO",
              "status": "unaffected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "sirt@juniper.net"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:*",
              "matchCriteriaId": "914D6984-1820-483B-AEB9-2C5257B5E900",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:19.2:r2:*:*:*:*:*:*",
              "matchCriteriaId": "14C57D33-01BB-4190-B787-F5BDACE82AFD",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*",
              "matchCriteriaId": "2D3C2D74-AF22-4BED-A0C5-089B5507D275",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:*",
              "matchCriteriaId": "83447F3F-79A3-41DF-8FD1-31DCFCBE40A4",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:19.4:r2:*:*:*:*:*:*",
              "matchCriteriaId": "2B14CED1-BEAF-4343-A05D-FB1E2B6AC955",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:19.4:r2-s1:*:*:*:*:*:*",
              "matchCriteriaId": "ABB91C38-8C70-436A-83DB-42B8DF81D7D8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:*",
              "matchCriteriaId": "F64FBB4B-7CBF-499B-A523-804857DEFAFA",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The system console configuration option \u0027log-out-on-disconnect\u0027 In Juniper Networks Junos OS Evolved fails to log out an active CLI session when the console cable is disconnected. This could allow a malicious attacker with physical access to the console the ability to resume a previous interactive session and possibly gain administrative privileges. This issue affects all Juniper Networks Junos OS Evolved versions after 18.4R1-EVO, prior to 20.2R1-EVO."
    },
    {
      "lang": "es",
      "value": "La opci\u00f3n de configuraci\u00f3n de la consola del sistema \"log-out-on-desconect\" en Juniper Networks Junos OS Evolved presenta un fallo al cerrar la sesi\u00f3n de una sesi\u00f3n de la CLI activa cuando el cable de la consola est\u00e1 desconectado.\u0026#xa0;Esto podr\u00eda permitir a un atacante malicioso con acceso f\u00edsico a la consola la capacidad de reanudar una sesi\u00f3n interactiva anterior y posiblemente conseguir privilegios administrativos.\u0026#xa0;Este problema afecta a todas las versiones de Juniper Networks Junos OS Evolved versiones posteriores a 18.4R1-EVO, anteriores a 20.2R1-EVO"
    }
  ],
  "id": "CVE-2020-1666",
  "lastModified": "2026-06-17T03:02:09.350",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.2,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "PHYSICAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.6,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.7,
        "impactScore": 5.9,
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
    ]
  },
  "published": "2020-10-16T21:15:12.677",
  "references": [
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.juniper.net/JSA11063"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.juniper.net/JSA11063"
    }
  ],
  "sourceIdentifier": "sirt@juniper.net",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ],
      "source": "sirt@juniper.net",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-613"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2020-1666 (GCVE-0-2020-1666)

Vulnerability from cvelistv5 – Published: 2020-10-16 20:31 – Updated: 2024-09-16 23:41

Title

Junos OS Evolved: 'console log-out-on-disconnect' fails to terminate session on console cable disconnection

Summary

Severity

6.6 (Medium)


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

CWE

CWE-284 - Improper Access Control

Assigner

juniper CNA under the mitre root

CNA scorecard B 85/100 over 175 records in the last 180 days details

References

1 reference

URL	Tags
https://kb.juniper.net/JSA11063	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
Juniper Networks	Junos OS Evolved	Affected: unspecified , < 20.2R1-EVO (custom) Unaffected: unspecified , < 18.4R1-EVO (custom)

Date Public

2020-10-14 00:00

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2024-08-04T06:46:29.785Z",
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            "url": "https://kb.juniper.net/JSA11063"
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          "versions": [
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          ]
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      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Console log out on disconnect is enabled via the following configuration stanza:\n  [system ports console log-out-on-disconnect]"
        }
      ],
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        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
      ],
      "metrics": [
        {
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            "attackVector": "PHYSICAL",
            "availabilityImpact": "HIGH",
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        "configuration": [
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}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
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