CVE-2021-31371 (GCVE-0-2021-31371)
Vulnerability from cvelistv5 – Published: 2021-10-19 18:17 – Updated: 2024-09-17 03:48
VLAI
EPSS
VEX
Title
Junos OS: QFX5000 Series: Traffic from the network internal to the device (128.0.0.0) may be forwarded to egress interfaces.
Summary
Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110, QFX5120, QFX5200, QFX5210 Series, and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2;
Severity
5.3 (Medium)
CWE
- CWE-200 - Information Exposure
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11236 | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
unspecified , < 17.3R3-S12
(custom)
Affected: 18.1 , < 18.1R3-S13 (custom) Affected: 18.3 , < 18.3R3-S5 (custom) Affected: 19.1 , < 19.1R3-S6 (custom) Affected: 19.2 , < 19.2R1-S7, 19.2R3-S3 (custom) Affected: 19.3 , < 19.3R2-S6, 19.3R3-S3 (custom) Affected: 19.4 , < 19.4R1-S4, 19.4R3-S5 (custom) Affected: 20.1 , < 20.1R2-S2, 20.1R3-S1 (custom) Affected: 20.2 , < 20.2R3-S2 (custom) Affected: 20.3 , < 20.3R3-S1 (custom) Affected: 20.4 , < 20.4R2-S1, 20.4R3 (custom) Affected: 21.1 , < 21.1R1-S1, 21.1R2 (custom) Affected: 21.2 , < 21.2R1 (custom) |
guessed |
Date Public
2021-10-13 00:00
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{
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{
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},
{
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},
{
"criteria": "cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*",
"matchCriteriaId": "20DDC6B7-BFC4-4F0B-8E68-442C23765BF2",
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},
{
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"matchCriteriaId": "C54B047C-4B38-40C0-9855-067DCF7E48BD",
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{
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"matchCriteriaId": "625BA7E6-D2AD-4A48-9B94-24328BE5B06A",
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}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
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"matchCriteriaId": "E974B4BC-64C5-4BB6-AF31-D46AF3763416",
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],
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],
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110, QFX5120, QFX5200, QFX5210 Series, and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2;"
},
{
"lang": "es",
"value": "El sistema operativo Junos de Juniper Networks utiliza la subred 128.0.0.0/2 para las comunicaciones internas entre el RE y los PFE. Se ha descubierto que los paquetes que utilizan estas direcciones IP pueden salir de un conmutador de la serie QFX5000, filtrando informaci\u00f3n de configuraci\u00f3n como los latidos del coraz\u00f3n, las versiones del kernel, etc. a Internet, lo que lleva a una vulnerabilidad de exposici\u00f3n de informaci\u00f3n. Este problema afecta al sistema operativo Junos de Juniper Networks en las series QFX5110, QFX5120, QFX5200, QFX5210 y QFX5100 con la imagen de la serie QFX 5e instalada: Todas las versiones anteriores a 17.3R3-S12; 18.1 versiones anteriores a 18.1R3-S13; 18.3 versiones anteriores a 18.3R3-S5; 19.1 versiones anteriores a 19.1R3-S6; 19.2 versiones anteriores a 19.2R1-S7, 19.2R3-S3; 19.3 versiones anteriores a 19.3R2-S6, 19.3R3-S3; 19. 4 versiones anteriores a 19.4R1-S4, 19.4R3-S5; 20.1 versiones anteriores a 20.1R2-S2, 20.1R3-S1; 20.2 versiones anteriores a 20.2R3-S2; 20.3 versiones anteriores a 20.3R3-S1; 20.4 versiones anteriores a 20.4R2-S1, 20.4R3; 21.1 versiones anteriores a 21.1R1-S1, 21.1R2;"
}
],
"id": "CVE-2021-31371",
"lastModified": "2024-11-21T06:05:32.210",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4,
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
},
"published": "2021-10-19T19:15:10.277",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Mitigation",
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA11236"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
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}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-200"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
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]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T14:08:25+00:00",
"cve": "CVE-2021-31371",
"id": "CVE-2021-31371",
"initial_release_date": "2021-10-13T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Junos OS: QFX5000 Series: Traffic from the network internal to the device (128.0.0.0) may be forwarded to egress interfaces.",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-31371.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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