FKIE_CVE-2021-0224
Vulnerability from fkie_nvd - Published: 2021-04-22 20:15 - Updated: 2026-06-17 03:29
Severity
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 (Medium) - CVSS:3.1/
Summary
A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R2.
References
| URL | Tags | ||
|---|---|---|---|
| sirt@juniper.net | https://kb.juniper.net/JSA11119 | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://kb.juniper.net/JSA11119 | Vendor Advisory |
Impacted products
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"matchCriteriaId": "41CD982F-E6F2-4951-9F96-A76C142DF08E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.1:r1-s2:*:*:*:*:*:*",
"matchCriteriaId": "19FDC05F-5582-4F7E-B628-E58A3C0E7F2F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.1:r1-s3:*:*:*:*:*:*",
"matchCriteriaId": "401306D1-E9CE-49C6-8DC9-0E8747B9DC2C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.1:r1-s4:*:*:*:*:*:*",
"matchCriteriaId": "615EAF48-AD53-4CC2-B233-5EA5C0F72CB1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.2:r1:*:*:*:*:*:*",
"matchCriteriaId": "CD07B7E2-F5C2-4610-9133-FDA9E66DFF4F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.2:r1-s1:*:*:*:*:*:*",
"matchCriteriaId": "D3C23AEB-34DE-44FB-8D64-E69D6E8B7401",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.2:r1-s2:*:*:*:*:*:*",
"matchCriteriaId": "18DB9401-5A51-4BB3-AC2F-58F58F1C788C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:20.2:r1-s3:*:*:*:*:*:*",
"matchCriteriaId": "06F53DA5-59AE-403C-9B1E-41CE267D8BB1",
"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
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R2."
},
{
"lang": "es",
"value": "Una vulnerabilidad en el manejo de los recursos internos necesarios para activar una gran cantidad de nodos de broadband remote access subscriber (BRAS) de Capa 2 en Juniper Networks Junos OS puede causar que el demonio Access Node Control Protocol se bloquee y reinicie, conllevando a una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS) sostenida.\u0026#xa0;El procesamiento continuo de los nodos de suscriptores falsificados crear\u00e1 una condici\u00f3n sostenida de Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;Cuando el n\u00famero de suscriptores que intentan conectarse excede el valor de entradas de tabla de descubrimiento m\u00e1ximo configurado, el suscriptor no se asigna a una entrada de vecino interno, causando que el proceso ANCPD se bloquee.\u0026#xa0;Este problema afecta a Juniper Networks Junos OS: todas las versiones anteriores a 17.3R3-S12;\u0026#xa0;versiones 17.4 anteriores a 17.4R2-S13;\u0026#xa0;versiones 18.1 anteriores a 18.1R3-S13;\u0026#xa0;versiones 18.2 anteriores a 18.2R3-S8;\u0026#xa0;versiones 18.3 anteriores a 18.3R3-S5;\u0026#xa0;versiones 18.\u0026#xa0;4 anteriores a 18.4R1-S8, 18.4R3-S8;\u0026#xa0;versiones 19.1 anteriores a 19.1R3-S4;\u0026#xa0;19.2 versiones anteriores a 19.2R3-S2;\u0026#xa0;versiones 19.3 anteriores a 19.3R3-S1;\u0026#xa0;versiones 19.4 anteriores a 19.4R3-S1;\u0026#xa0;versiones 20.1 anteriores a 20.1R2;\u0026#xa0;versiones 20.2 anteriores a 20.2R2;\u0026#xa0;versiones 20.3 anteriores a 20.3R2"
}
],
"id": "CVE-2021-0224",
"lastModified": "2026-06-17T03:29:32.020",
"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"
},
{
"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": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-04-22T20:15:08.427",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11119"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11119"
}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
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.
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.