CVE-2021-0233 (GCVE-0-2021-0233)
Vulnerability from cvelistv5 – Published: 2021-04-22 19:37 – Updated: 2024-09-16 18:14
VLAI
EPSS
VEX
Title
Junos OS: ACX500 Series, ACX4000 Series: Denial of Service due to FFEB crash while processing high rate of specific packets.
Summary
A vulnerability in Juniper Networks Junos OS ACX500 Series, ACX4000 Series, may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a Forwarding Engine Board (FFEB) crash. Continued receipt of these packets will sustain the Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX500 Series, ACX4000 Series: 17.4 versions prior to 17.4R3-S2.
Severity
7.5 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11128 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
17.4 , < 17.4R3-S2
(custom)
|
guessed |
Date Public
2021-04-14 00:00
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*",
"matchCriteriaId": "5E327643-D8D8-4EFA-9F38-BA862A919501",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:17.4:r2-s8:*:*:*:*:*:*",
"matchCriteriaId": "1BC6CE1C-9DD8-429E-BDC2-251D8C8674E3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:17.4:r2-s9:*:*:*:*:*:*",
"matchCriteriaId": "63B00B4F-3E65-4CB2-807D-43908B570AE6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*",
"matchCriteriaId": "8732E25A-9073-4C7B-9E89-C02368728EB4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:juniper:junos:17.4:r3-s1:*:*:*:*:*:*",
"matchCriteriaId": "09255363-BF79-4FC3-AADD-5FAD0902174F",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:juniper:acx4000:-:*:*:*:*:*:*:*",
"matchCriteriaId": "76E2CDA9-2379-482C-B509-D527AFE2C7D5",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:juniper:acx500:-:*:*:*:*:*:*:*",
"matchCriteriaId": "36729286-5080-47E8-A961-976BF64F5A93",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in Juniper Networks Junos OS ACX500 Series, ACX4000 Series, may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a Forwarding Engine Board (FFEB) crash. Continued receipt of these packets will sustain the Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX500 Series, ACX4000 Series: 17.4 versions prior to 17.4R3-S2."
},
{
"lang": "es",
"value": "Una vulnerabilidad en Juniper Networks Junos OS en las Series ACX500, ACX4000, puede permitir a un atacante causar una Denegaci\u00f3n de Servicio (DoS) mediante el env\u00edo de una alta tasa de paquetes espec\u00edficos hacia el dispositivo, resultando en un bloqueo de Forwarding Engine Board (FFEB).\u0026#xa0;La recepci\u00f3n continua de estos paquetes mantendr\u00e1 la condici\u00f3n de Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;Este problema afecta a Juniper Networks Junos OS en ACX500 Series, ACX4000 Series: versiones 17.4 anteriores a 17.4R3-S2"
}
],
"id": "CVE-2021-0233",
"lastModified": "2024-11-21T05:42:15.917",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
},
"published": "2021-04-22T20:15:08.740",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11128"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11128"
}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-794"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T15:15:14+00:00",
"cve": "CVE-2021-0233",
"id": "CVE-2021-0233",
"initial_release_date": "2021-04-14T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Junos OS: ACX500 Series, ACX4000 Series: Denial of Service due to FFEB crash while processing high rate of specific packets.",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-0233.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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