FKIE_CVE-2021-0227
Vulnerability from fkie_nvd - Published: 2021-04-22 20:15 - Updated: 2026-06-17 03:29
Severity
Summary
An improper restriction of operations within the bounds of a memory buffer vulnerability in Juniper Networks Junos OS J-Web on SRX Series devices allows an attacker to cause Denial of Service (DoS) by sending certain crafted HTTP packets. Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. When this issue occurs, web-management, NTP daemon (ntpd) and Layer 2 Control Protocol process (L2CPD) daemons might crash. This issue affects Juniper Networks Junos OS on SRX Series: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.2 versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S3; 18.4 versions prior to 18.4R2-S5, 18.4R3-S4; 19.1 versions prior to 19.1R3-S2; 19.2 versions prior to 19.2R1-S5, 19.2R3; 19.3 versions prior to 19.3R3; 19.4 versions prior to 19.4R2-S1, 19.4R3; 20.1 versions prior to 20.1R1-S2, 20.1R2;
References
| URL | Tags | ||
|---|---|---|---|
| sirt@juniper.net | https://kb.juniper.net/JSA11122 | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://kb.juniper.net/JSA11122 | Vendor Advisory |
Impacted products
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An improper restriction of operations within the bounds of a memory buffer vulnerability in Juniper Networks Junos OS J-Web on SRX Series devices allows an attacker to cause Denial of Service (DoS) by sending certain crafted HTTP packets. Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. When this issue occurs, web-management, NTP daemon (ntpd) and Layer 2 Control Protocol process (L2CPD) daemons might crash. This issue affects Juniper Networks Junos OS on SRX Series: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.2 versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S3; 18.4 versions prior to 18.4R2-S5, 18.4R3-S4; 19.1 versions prior to 19.1R3-S2; 19.2 versions prior to 19.2R1-S5, 19.2R3; 19.3 versions prior to 19.3R3; 19.4 versions prior to 19.4R2-S1, 19.4R3; 20.1 versions prior to 20.1R1-S2, 20.1R2;"
},
{
"lang": "es",
"value": "Una vulnerabilidad de restricci\u00f3n inapropiada de operaciones dentro de los l\u00edmites de un b\u00fafer de memoria en Juniper Networks Junos OS J-Web en dispositivos de la serie SRX permite a un atacante causar una Denegaci\u00f3n de Servicio (DoS) mediante el env\u00edo de determinados paquetes HTTP dise\u00f1ados.\u0026#xa0;La recepci\u00f3n y el procesamiento continuo de estos paquetes crear\u00e1n una condici\u00f3n sostenida de Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;Cuando ocurre este problema, la administraci\u00f3n web, el demonio NTP (ntpd) y el demonio del proceso Layer 2 Control Protocol (L2CPD) pueden bloquearse.\u0026#xa0;Este problema afecta a Juniper Networks Junos OS en la serie SRX: versiones 17.3 anteriores a 17.3R3-S9;\u0026#xa0;versiones 17.4 anteriores a 17.4R2-S11, 17.4R3-S2;\u0026#xa0;versiones 18.2 anteriores a 18.2R3-S5;\u0026#xa0;versiones 18.3 anteriores a 18.3R2-S4, 18.3R3-S3;\u0026#xa0;versiones 18.4 anteriores a 18.4R2-S5, 18.4R3-S4;\u0026#xa0;versiones 19.1 anteriores a 19.1R3-S2;\u0026#xa0;versiones 19.2 anteriores a 19.2R1-S5, 19.2R3;\u0026#xa0;versiones 19.3 anteriores a 19.3R3;\u0026#xa0;versiones 19.\u0026#xa0;4 anteriores a 19.4R2-S1, 19.4R3;\u0026#xa0;versiones 20.1 anteriores a 20.1R1-S2, 20.1R2;"
}
],
"id": "CVE-2021-0227",
"lastModified": "2026-06-17T03:29:32.457",
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{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
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"authentication": "NONE",
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"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
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"tags": [
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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.