CVE-2021-31362 (GCVE-0-2021-31362)
Vulnerability from cvelistv5 – Published: 2021-10-19 18:16 – Updated: 2024-09-17 00:15
VLAI
EPSS
VEX
Title
Junos OS and Junos OS Evolved: An IS-IS adjacency might be taken down if a bad hello PDU is received for an existing adjacency causing a DoS
Summary
A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO.
Severity
6.5 (Medium)
CWE
- CWE-693 - Protection Mechanism Failure
- Denial of Service (DoS)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11224 | x_refsource_CONFIRM |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
unspecified , < 18.2R3-S8
(custom)
Affected: 18.3 , < 18.3R3-S5 (custom) Affected: 18.4 , < 18.4R3-S9 (custom) Affected: 19.1 , < 19.1R3-S7 (custom) Affected: 19.2 , < 19.2R1-S7, 19.2R3-S3 (custom) Affected: 19.3 , < 19.3R2-S6, 19.3R3-S2 (custom) Affected: 19.4 , < 19.4R3-S3 (custom) Affected: 20.1 , < 20.1R3 (custom) Affected: 20.2 , < 20.2R3 (custom) Affected: 20.3 , < 20.3R3 (custom) Affected: 20.4 , < 20.4R2 (custom) |
guessed | |
| Juniper Networks | Junos OS Evolved |
Affected:
unspecified , < 20.4R2-EVO
(custom)
Affected: 21.1 , < 21.1R2-EVO (custom) |
guessed |
Date Public
2021-10-13 00:00
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"value": "A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO."
},
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"value": "Una vulnerabilidad de fallo de mecanismo de protecci\u00f3n en RPD (demonio de protocolo de enrutamiento) de Juniper Networks Junos OS y Junos OS Evolved permite a un atacante adyacente no autenticado causar una ca\u00edda de adyacencias IS-IS establecidas mediante el env\u00edo de una PDU de saludo falsa que conlleva a una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS). Una recepci\u00f3n continuada de estas PDU falsas crear\u00e1 una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS) sostenida. Este problema afecta a: Juniper Networks Junos OS Todas las versiones anteriores a 18.2R3-S8; versiones 18.3 anteriores a 18.3R3-S5; versiones 18.4 anteriores a 18.4R3-S9; versiones 19.1 anteriores a 19.1R3-S7; versiones 19.2 anteriores a 19.2R1-S7, 19.2R3-S3; 19. 3 versiones anteriores a 19.3R2-S6, 19.3R3-S2; versiones 19.4 anteriores a 19.4R3-S3; versiones 20.1 anteriores a 20.1R3; versiones 20.2 anteriores a 20.2R3; versiones 20.3 anteriores a 20.3R3; versiones 20.4 anteriores a 20.4R2. Juniper Networks Junos OS Evolved Todas las versiones anteriores a 20.4R2-EVO; versiones 21.1 anteriores a 21.1R2-EVO"
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"matchCriteriaId": "8E0D4959-3865-42A7-98CD-1103EBD84528",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:*",
"matchCriteriaId": "3A58292B-814C-49E7-8D6D-BE26EFB9ADDF",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.3:r1:*:*:*:*:*:*",
"matchCriteriaId": "5C9BC697-C7C9-447D-9EBD-E9711462583E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.3:r1-s1:*:*:*:*:*:*",
"matchCriteriaId": "7B80433B-57B1-49EF-B1A1-83781D6102E3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:*",
"matchCriteriaId": "05D8427C-CDDE-4B2F-9CB8-41B9137660E4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:*",
"matchCriteriaId": "F3DC01F2-6DFE-4A8E-9962-5E59AA965935",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*",
"matchCriteriaId": "20DDC6B7-BFC4-4F0B-8E68-442C23765BF2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*",
"matchCriteriaId": "037BA01C-3F5C-4503-A633-71765E9EF774",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4C8EA231-338B-46A2-BE77-3A7AB54BD148",
"versionEndIncluding": "20.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*",
"matchCriteriaId": "C9C8866D-162F-4C9B-8167-2FBA25410368",
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},
{
"criteria": "cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:*",
"matchCriteriaId": "F85E5BC7-8607-4330-AA72-2273D32F8604",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:*",
"matchCriteriaId": "878C81C9-A418-4A21-8FDB-2116A992679C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos_os_evolved:21.1:-:*:*:*:*:*:*",
"matchCriteriaId": "52C3552E-798F-4719-B38D-F74E34EAAA40",
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},
{
"criteria": "cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*",
"matchCriteriaId": "AE674DD3-3590-4434-B144-5AD7EB5F039D",
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},
{
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"matchCriteriaId": "0099BDA9-9D4B-4D6C-8234-EFD9E8C63476",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO."
},
{
"lang": "es",
"value": "Una vulnerabilidad de fallo de mecanismo de protecci\u00f3n en RPD (demonio de protocolo de enrutamiento) de Juniper Networks Junos OS y Junos OS Evolved permite a un atacante adyacente no autenticado causar una ca\u00edda de adyacencias IS-IS establecidas mediante el env\u00edo de una PDU de saludo falsa que conlleva a una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS). Una recepci\u00f3n continuada de estas PDU falsas crear\u00e1 una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS) sostenida. Este problema afecta a: Juniper Networks Junos OS Todas las versiones anteriores a 18.2R3-S8; versiones 18.3 anteriores a 18.3R3-S5; versiones 18.4 anteriores a 18.4R3-S9; versiones 19.1 anteriores a 19.1R3-S7; versiones 19.2 anteriores a 19.2R1-S7, 19.2R3-S3; 19. 3 versiones anteriores a 19.3R2-S6, 19.3R3-S2; versiones 19.4 anteriores a 19.4R3-S3; versiones 20.1 anteriores a 20.1R3; versiones 20.2 anteriores a 20.2R3; versiones 20.3 anteriores a 20.3R3; versiones 20.4 anteriores a 20.4R2. Juniper Networks Junos OS Evolved Todas las versiones anteriores a 20.4R2-EVO; versiones 21.1 anteriores a 21.1R2-EVO"
}
],
"id": "CVE-2021-31362",
"lastModified": "2024-11-21T06:05:30.550",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "LOW",
"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"
},
"exploitabilityScore": 6.5,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
},
"published": "2021-10-19T19:15:09.253",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11224"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11224"
}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-693"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-Other"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T14:08:29+00:00",
"cve": "CVE-2021-31362",
"id": "CVE-2021-31362",
"initial_release_date": "2021-10-13T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Junos OS and Junos OS Evolved: An IS-IS adjacency might be taken down if a bad hello PDU is received for an existing adjacency causing a DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-31362.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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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