CVE-2021-0269 (GCVE-0-2021-0269)
Vulnerability from cvelistv5 – Published: 2021-04-22 19:37 – Updated: 2024-09-17 01:12
VLAI
EPSS
VEX
Title
Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks.
Summary
The improper handling of client-side parameters in J-Web of Juniper Networks Junos OS allows an attacker to perform a number of different malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, including hardcoded parameters within the HTTP/S session, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and otherwise alter and modify J-Web's normal behavior. An attacker may be able to transition victims to malicious web services, or exfiltrate sensitive information from otherwise secure web forms. This issue affects: Juniper Networks Junos OS: All versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2.
Severity
8.8 (High)
CWE
- CWE-233 - Improper Handling of Parameters
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11160 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
unspecified , < 17.4R3-S3
(custom)
Affected: 18.1 , < 18.1R3-S12 (custom) Affected: 18.2 , < 18.2R3-S6 (custom) Affected: 18.3 , < 18.3R3-S4 (custom) Affected: 18.4 , < 18.4R3-S6 (custom) Affected: 19.1 , < 19.1R3-S4 (custom) Affected: 19.2 , < 19.2R3-S1 (custom) Affected: 19.3 , < 19.3R3-S1 (custom) Affected: 19.4 , < 19.4R2-S2, 19.4R3 (custom) Affected: 20.1 , < 20.1R2 (custom) Affected: 20.2 , < 20.2R2 (custom) |
guessed |
Date Public
2021-04-14 00:00
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{
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{
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],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The improper handling of client-side parameters in J-Web of Juniper Networks Junos OS allows an attacker to perform a number of different malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, including hardcoded parameters within the HTTP/S session, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and otherwise alter and modify J-Web\u0027s normal behavior. An attacker may be able to transition victims to malicious web services, or exfiltrate sensitive information from otherwise secure web forms. This issue affects: Juniper Networks Junos OS: All versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2."
},
{
"lang": "es",
"value": "El manejo inapropiado de los par\u00e1metros client-side en J-Web de Juniper Networks Junos OS, permite a un atacante llevar a cabo una serie de diferentes acciones maliciosas contra un dispositivo objetivo cuando un usuario est\u00e1 autenticado en J-Web.\u0026#xa0;Un atacante puede ser capaz de reemplazar los par\u00e1metros existentes, incluyendo los par\u00e1metros embebidos dentro de la sesi\u00f3n HTTP/S, las variables de acceso y explotaci\u00f3n, la omisi\u00f3n de las reglas de firewall de aplicaciones web o los mecanismos de comprobaci\u00f3n de entrada, y de otro modo alterar y modificar el comportamiento normal de J-Web.\u0026#xa0;Un atacante puede ser capaz de transferir a las v\u00edctimas a servicios web maliciosos o exfiltrar informaci\u00f3n confidencial de formularios web que de otro modo ser\u00edan seguros.\u0026#xa0;Este problema afecta a: Juniper Networks Junos OS: todas las versiones anteriores a 17.4R3-S3;\u0026#xa0;versiones 18.1 anteriores a 18.1R3-S12;\u0026#xa0;versiones 18.2 anteriores a 18.2R3-S6;\u0026#xa0;versiones 18.3 anteriores a 18.3R3-S4;\u0026#xa0;versiones 18.4 anteriores a 18.4R3-S6;\u0026#xa0;versiones 19.1 anteriores a 19.1R3-S4;\u0026#xa0;versiones 19.2 anteriores a 19.2R3-S1;\u0026#xa0;versiones 19.3 anteriores a 19.3R3-S1;\u0026#xa0;versiones 19.4 anteriores a 19.4R2-S2, 19.4R3;\u0026#xa0;versiones 20.1 anteriores a 20.1R2;\u0026#xa0;versiones 20.2 anteriores a 20.2R2"
}
],
"id": "CVE-2021-0269",
"lastModified": "2024-11-21T05:42:21.877",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 5.1,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
},
"published": "2021-04-22T20:15:09.980",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11160"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11160"
}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-233"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-Other"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T15:14:58+00:00",
"cve": "CVE-2021-0269",
"id": "CVE-2021-0269",
"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: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks.",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-0269.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
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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.