FKIE_CVE-2021-0208
Vulnerability from fkie_nvd - Published: 2021-01-15 18:15 - Updated: 2026-06-17 03:29
Severity
Summary
An improper input validation vulnerability in the Routing Protocol Daemon (RPD) service of Juniper Networks Junos OS allows an attacker to send a malformed RSVP packet when bidirectional LSPs are in use, which when received by an egress router crashes the RPD causing a Denial of Service (DoS) condition. Continued receipt of the packet will sustain the Denial of Service. This issue affects: Juniper Networks Junos OS: All versions prior to 17.3R3-S10 except 15.1X49-D240 for SRX series; 17.4 versions prior to 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S4; 18.3 versions prior to 18.3R3-S2; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S2; 19.1 versions prior to 19.1R1-S5, 19.1R3-S3; 19.2 versions prior to 19.2R3; 19.3 versions prior to 19.3R2-S5, 19.3R3; 19.4 versions prior to 19.4R2-S2, 19.4R3-S1; 20.1 versions prior to 20.1R1-S4, 20.1R2; 15.1X49 versions prior to 15.1X49-D240 on SRX Series. Juniper Networks Junos OS Evolved: 19.3 versions prior to 19.3R2-S5-EVO; 19.4 versions prior to 19.4R2-S2-EVO; 20.1 versions prior to 20.1R1-S4-EVO.
References
Impacted products
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An improper input validation vulnerability in the Routing Protocol Daemon (RPD) service of Juniper Networks Junos OS allows an attacker to send a malformed RSVP packet when bidirectional LSPs are in use, which when received by an egress router crashes the RPD causing a Denial of Service (DoS) condition. Continued receipt of the packet will sustain the Denial of Service. This issue affects: Juniper Networks Junos OS: All versions prior to 17.3R3-S10 except 15.1X49-D240 for SRX series; 17.4 versions prior to 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S4; 18.3 versions prior to 18.3R3-S2; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S2; 19.1 versions prior to 19.1R1-S5, 19.1R3-S3; 19.2 versions prior to 19.2R3; 19.3 versions prior to 19.3R2-S5, 19.3R3; 19.4 versions prior to 19.4R2-S2, 19.4R3-S1; 20.1 versions prior to 20.1R1-S4, 20.1R2; 15.1X49 versions prior to 15.1X49-D240 on SRX Series. Juniper Networks Junos OS Evolved: 19.3 versions prior to 19.3R2-S5-EVO; 19.4 versions prior to 19.4R2-S2-EVO; 20.1 versions prior to 20.1R1-S4-EVO."
},
{
"lang": "es",
"value": "Una vulnerabilidad de comprobaci\u00f3n de entrada inapropiada en el servicio Routing Protocol Daemon (RPD) de Juniper Networks Junos OS permite a un atacante enviar un paquete RSVP malformado cuando LSP bidireccionales son usados, que cuando lo recibe un enrutador de salida bloquea el RPD causando una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;La recepci\u00f3n continua del paquete respaldar\u00e1 la Denegaci\u00f3n de servicio.\u0026#xa0;Este problema afecta a: Juniper Networks Junos OS: todas las versiones anteriores a 17.3R3-S10 excepto 15.1X49-D240 para la serie SRX;\u0026#xa0;versiones 17.4 anteriores a 17.4R3-S2;\u0026#xa0;versiones 18.1 anteriores a 18.1R3-S10;\u0026#xa0;versiones 18.2 anteriores a 18.2R2-S7, 18.2R3-S4;\u0026#xa0;versiones 18.3 anteriores a 18.3R3-S2;\u0026#xa0;versiones 18.4 anteriores a 18.4R1-S8, 18.4R2-S6, 18.4R3-S2;\u0026#xa0;versiones 19.1 anteriores a 19.1R1-S5, 19.1R3-S3;\u0026#xa0;versiones 19.2 anteriores a 19.2R3;\u0026#xa0;versiones 19.3 anteriores a 19.3R2-S5, 19.3R3;\u0026#xa0;versiones 19.4 anteriores a 19.4R2-S2, 19.4R3-S1;\u0026#xa0;versiones 20.\u0026#xa0;1 anteriores a 20.1R1-S4, 20.1R2;\u0026#xa0;versiones de 15.1X49 anteriores a 15.1X49-D240 en la serie SRX.\u0026#xa0;Juniper Networks Junos OS Evolved: versiones 19.3 anteriores a 19.3R2-S5-EVO;\u0026#xa0;versiones 19.4 anteriores a 19.4R2-S2-EVO;\u0026#xa0;versiones 20.1 anteriores a 20.1R1-S4-EVO"
}
],
"id": "CVE-2021-0208",
"lastModified": "2026-06-17T03:29:29.383",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
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"accessVector": "ADJACENT_NETWORK",
"authentication": "NONE",
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"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,
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"source": "nvd@nist.gov",
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],
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{
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"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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},
"published": "2021-01-15T18:15:14.947",
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{
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"tags": [
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"url": "https://kb.juniper.net/JSA11098"
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"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
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"value": "CWE-20"
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],
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"type": "Secondary"
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],
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]
}
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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.