Vulnerability-Lookup

GSD-2021-31363

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO.

Aliases

CVE-2021-31363

Aliases

CVE-2021-31363

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-31363",
    "description": "In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO.",
    "id": "GSD-2021-31363"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-31363"
      ],
      "details": "In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO.",
      "id": "GSD-2021-31363",
      "modified": "2023-12-13T01:23:13.271359Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "sirt@juniper.net",
        "DATE_PUBLIC": "2021-10-13T16:00:00.000Z",
        "ID": "CVE-2021-31363",
        "STATE": "PUBLIC",
        "TITLE": "Junos OS and Junos OS Evolved: Receipt of a specific LDP message will cause a Denial of Service"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Junos OS",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003e=",
                          "version_name": "19.2",
                          "version_value": "19.2R2"
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                        {
                          "version_affected": "\u003c",
                          "version_name": "19.2",
                          "version_value": "19.2R3-S3"
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                          "version_name": "19.3",
                          "version_value": "19.3R2-S6, 19.3R3-S2"
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                        {
                          "version_affected": "\u003c",
                          "version_name": "19.4",
                          "version_value": "19.4R1-S4, 19.4R2-S4, 19.4R3-S2"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "20.1",
                          "version_value": "20.1R2-S1, 20.1R3"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "20.2",
                          "version_value": "20.2R2-S1, 20.2R3"
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                        {
                          "version_affected": "\u003c",
                          "version_name": "20.3",
                          "version_value": "20.3R1-S2, 20.3R2"
                        },
                        {
                          "version_affected": "!\u003c",
                          "version_value": "19.2R2"
                        }
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                  },
                  {
                    "product_name": "Junos OS Evolved",
                    "version": {
                      "version_data": [
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                          "version_affected": "\u003c",
                          "version_value": "20.1R2-S3-EVO"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "20.3",
                          "version_value": "20.3R1-S2-EVO"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Juniper Networks"
            }
          ]
        }
      },
      "configuration": [
        {
          "lang": "eng",
          "value": "A vulnerable Junos OS configuration would need to have:\n  [protocols ldp p2mp]\nand\n  [protocols ldp traffic-statistics sensor-based-stats]\n\nFor Junos OS Evolved only:\n  [protocols ldp p2mp]\nis need as sensor-based-stats is the default setting which can\u0027t be changed."
        }
      ],
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      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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          {
            "lang": "eng",
            "value": "In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO."
          }
        ]
      },
      "exploit": [
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          "lang": "eng",
          "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
      ],
      "generator": {
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      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
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                "lang": "eng",
                "value": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
              }
            ]
          },
          {
            "description": [
              {
                "lang": "eng",
                "value": "Denial of Service (DoS)"
              }
            ]
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        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://kb.juniper.net/JSA11225",
            "refsource": "CONFIRM",
            "url": "https://kb.juniper.net/JSA11225"
          }
        ]
      },
      "solution": [
        {
          "lang": "eng",
          "value": "The following software releases have been updated to resolve this specific issue in Junos OS: 19.2R3-S3, 19.3R2-S6, 19.3R3-S2, 19.4R1-S4, 19.4R2-S4, 19.4R3-S2, 20.1R2-S1, 20.1R3, 20.2R2-S1, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases.\n\nThe following software releases have been updated to resolve this specific issue in Junos OS Evolved: 20.1R2-S3-EVO, 20.3R1-S2-EVO, 20.4R1-EVO, and all subsequent releases.\n"
        }
      ],
      "source": {
        "advisory": "JSA11225",
        "defect": [
          "1552041"
        ],
        "discovery": "USER"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "For Junos OS turn off sensor-based-stats by deleting:\n\n  [protocols ldp traffic-statistics sensor-based-stats]\n\nFor Junos OS Evolved mLDP will have to be turned off as sensor-based-stats is the default:\n\n  [protocols ldp p2mp]"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
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          "ASSIGNER": "sirt@juniper.net",
          "ID": "CVE-2021-31363"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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            {
              "lang": "en",
              "value": "In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
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                  "value": "CWE-835"
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        "references": {
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              "name": "https://kb.juniper.net/JSA11225",
              "refsource": "CONFIRM",
              "tags": [
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                "Vendor Advisory"
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              "url": "https://kb.juniper.net/JSA11225"
            }
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          "acInsufInfo": false,
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            "accessVector": "ADJACENT_NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 3.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
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          "exploitabilityScore": 6.5,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "exploitabilityScore": 2.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-10-25T17:14Z",
      "publishedDate": "2021-10-19T19:15Z"
    }
  }
}

CVE-2021-31363 (GCVE-0-2021-31363)

Vulnerability from cvelistv5 – Published: 2021-10-19 18:16 – Updated: 2024-09-16 16:23

Title

Junos OS and Junos OS Evolved: Receipt of a specific LDP message will cause a Denial of Service

Summary

Severity

6.5 (Medium)


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

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Denial of Service (DoS)

Assigner

juniper CNA under the mitre root

CNA scorecard B 84/100 over 193 records in the last 180 days details

References

1 reference

URL	Tags
https://kb.juniper.net/JSA11225	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version
Juniper Networks	Junos OS	Unaffected: unspecified , < 19.2R2 (custom) Affected: 19.2R2 , < 19.2* (custom) Affected: 19.3 , < 19.3R2-S6, 19.3R3-S2 (custom) Affected: 19.4 , < 19.4R1-S4, 19.4R2-S4, 19.4R3-S2 (custom) Affected: 20.1 , < 20.1R2-S1, 20.1R3 (custom) Affected: 20.2 , < 20.2R2-S1, 20.2R3 (custom) Affected: 20.3 , < 20.3R1-S2, 20.3R2 (custom)
Juniper Networks	Junos OS Evolved	Affected: unspecified , < 20.1R2-S3-EVO (custom) Affected: 20.3 , < 20.3R1-S2-EVO (custom)

Date Public

2021-10-13 00:00

Show details on NVD website

JSON

To clipboard

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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

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
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.

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