CVE-2021-0236 (GCVE-0-2021-0236)
Vulnerability from cvelistv5 – Published: 2021-04-22 19:37 – Updated: 2024-09-16 19:15
VLAI
EPSS
VEX
Title
Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.
Summary
Due to an improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved the Routing Protocol Daemon (RPD) service, upon receipt of a specific matching BGP packet meeting a specific term in the flowspec configuration, crashes and restarts causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO.
Severity
6.5 (Medium)
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
- Denial of Service (DoS)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11131 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Unaffected:
unspecified , < 18.4R1
(custom)
Affected: 18.4 , < 18.4R1-S8, 18.4R2-S7, 18.4R3-S7 (custom) Affected: 19.1 , < 19.1R2-S2, 19.1R3-S4 (custom) Affected: 19.2 , < 19.2R1-S6, 19.2R3-S2 (custom) Affected: 19.3 , < 19.3R3-S2 (custom) Affected: 19.4 , < 19.4R2-S4, 19.4R3-S1 (custom) Affected: 20.1 , < 20.1R2, 20.1R3, 20.1R3-EVO (custom) Affected: 20.2 , < 20.2R2, 20.2R3, 20.2R3-EVO (custom) Affected: 20.3 , < 20.3R1-S1, 20.3R2, 20.3R2-EVO (custom) |
guessed | |
| Juniper Networks | Junos OS Evolved |
Unaffected:
unspecified , < 18.4R1-EVO
(custom)
Affected: 20.3-EVO , < 20.3R2-EVO (custom) |
guessed |
Date Public
2021-04-14 00:00
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Due to an improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved the Routing Protocol Daemon (RPD) service, upon receipt of a specific matching BGP packet meeting a specific term in the flowspec configuration, crashes and restarts causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO."
},
{
"lang": "es",
"value": "Debido a una comprobaci\u00f3n inapropiada de condiciones inusuales o excepcionales en Juniper Networks Junos OS y Junos OS Evolved, el Routing Protocol Daemon (RPD), al recibir un paquete BGP espec\u00edfico que coincide con un t\u00e9rmino espec\u00edfico en la configuraci\u00f3n de flowpec, se bloquea y se reinicia causando una Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;La recepci\u00f3n y el procesamiento continuo de este paquete crear\u00e1n una condici\u00f3n sostenida de Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;Este problema afecta solo a las implementaciones Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec.\u0026#xa0;Este problema afecta a: Juniper Networks Junos OS: versiones 18.4 anteriores a 18.4R1-S8, 18.4R2-S7, 18.4R3-S7;\u0026#xa0;versiones 19.1 anteriores a 19.1R2-S2, 19.1R3-S4;\u0026#xa0;versiones 19.2 anteriores a 19.2R1-S6, 19.2R3-S2;\u0026#xa0;versiones 19.3 anteriores a 19.3R3-S2;\u0026#xa0;versiones 19.4 anteriores a 19.4R2-S4, 19.4R3-S1;\u0026#xa0;versiones 20.1 anteriores a 20.1R2, 20.1R3;\u0026#xa0;versiones 20.2 anteriores a 20.2R2, 20.2R3;\u0026#xa0;versiones 20.\u0026#xa0;3 anteriores a 20.3R1-S1, 20.3R2.\u0026#xa0;Juniper Networks Junos OS Evolved: todas las versiones posteriores a 18.4R1-EVO anteriores a 20.3R2-EVO.\u0026#xa0;Este problema no afecta a: Juniper Networks Junos OS versiones anteriores a 18.4R1.\u0026#xa0;Juniper Networks Junos OS Evolved versiones anteriores a 18.4R1-EVO"
}
],
"id": "CVE-2021-0236",
"lastModified": "2024-11-21T05:42:16.330",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "COMPLETE",
"baseScore": 6.8,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 8.0,
"impactScore": 6.9,
"obtainAllPrivilege": false,
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"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/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": "2021-04-22T20:15:08.843",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
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],
"url": "https://kb.juniper.net/JSA11131"
},
{
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"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
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"value": "CWE-754"
}
],
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"type": "Secondary"
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{
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{
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"value": "CWE-754"
}
],
"source": "nvd@nist.gov",
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},
"redhat_vex": {
"current_release_date": "2026-03-27T15:15:13+00:00",
"cve": "CVE-2021-0236",
"id": "CVE-2021-0236",
"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: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-0236.json",
"version": "3"
}
}
}
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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
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.
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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.