CVE-2021-0205 (GCVE-0-2021-0205)
Vulnerability from cvelistv5 – Published: 2021-01-15 17:35 – Updated: 2024-09-16 17:28
VLAI
EPSS
VEX
Title
Junos OS: MX Series: Dynamic filter fails to match IPv6 prefix
Summary
When the "Intrusion Detection Service" (IDS) feature is configured on Juniper Networks MX series with a dynamic firewall filter using IPv6 source or destination prefix, it may incorrectly match the prefix as /32, causing the filter to block unexpected traffic. This issue affects only IPv6 prefixes when used as source and destination. This issue affects MX Series devices using MS-MPC, MS-MIC or MS-SPC3 service cards with IDS service configured. This issue affects: Juniper Networks Junos OS 17.3 versions prior to 17.3R3-S10 on MX Series; 17.4 versions prior to 17.4R3-S3 on MX Series; 18.1 versions prior to 18.1R3-S11 on MX Series; 18.2 versions prior to 18.2R3-S6 on MX Series; 18.3 versions prior to 18.3R3-S4 on MX Series; 18.4 versions prior to 18.4R3-S6 on MX Series; 19.1 versions prior to 19.1R2-S2, 19.1R3-S3 on MX Series; 19.2 versions prior to 19.2R3-S1 on MX Series; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1 on MX Series; 19.4 versions prior to 19.4R3 on MX Series; 20.1 versions prior to 20.1R2 on MX Series; 20.2 versions prior to 20.2R2 on MX Series;
Severity
5.8 (Medium)
CWE
- CWE-284 - Improper Access Control
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11095 | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
17.3 , < 17.3R3-S10
(custom)
Affected: 17.4 , < 17.4R3-S3 (custom) Affected: 18.1 , < 18.1R3-S11 (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 , < 19.1R2-S2, 19.1R3-S3 (custom) Affected: 19.2 , < 19.2R3-S1 (custom) Affected: 19.3 , < 19.3R2-S5, 19.3R3-S1 (custom) Affected: 19.4 , < 19.4R3 (custom) Affected: 20.1 , < 20.1R2 (custom) Affected: 20.2 , < 20.2R2 (custom) |
guessed |
Date Public
2021-01-13 00:00
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "When the \"Intrusion Detection Service\" (IDS) feature is configured on Juniper Networks MX series with a dynamic firewall filter using IPv6 source or destination prefix, it may incorrectly match the prefix as /32, causing the filter to block unexpected traffic. This issue affects only IPv6 prefixes when used as source and destination. This issue affects MX Series devices using MS-MPC, MS-MIC or MS-SPC3 service cards with IDS service configured. This issue affects: Juniper Networks Junos OS 17.3 versions prior to 17.3R3-S10 on MX Series; 17.4 versions prior to 17.4R3-S3 on MX Series; 18.1 versions prior to 18.1R3-S11 on MX Series; 18.2 versions prior to 18.2R3-S6 on MX Series; 18.3 versions prior to 18.3R3-S4 on MX Series; 18.4 versions prior to 18.4R3-S6 on MX Series; 19.1 versions prior to 19.1R2-S2, 19.1R3-S3 on MX Series; 19.2 versions prior to 19.2R3-S1 on MX Series; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1 on MX Series; 19.4 versions prior to 19.4R3 on MX Series; 20.1 versions prior to 20.1R2 on MX Series; 20.2 versions prior to 20.2R2 on MX Series;"
},
{
"lang": "es",
"value": "Cuando la funcionalidad \"Intrusion Detection Service\" (IDS) est\u00e1 configurada en la serie Juniper Networks MX con un filtro de firewall din\u00e1mico usando el prefijo de origen o destino de IPv6, puede coincidir incorrectamente con el prefijo como /32, causando que el filtro bloquee el tr\u00e1fico inesperado.\u0026#xa0;Este problema afecta solo a los prefijos de IPv6 cuando se utilizan como origen y destino.\u0026#xa0;Este problema afecta a los dispositivos de la Serie MX que utilizan tarjetas de servicio MS-MPC, MS-MIC o MS-SPC3 con el servicio IDS configurado.\u0026#xa0;Este problema afecta a: Juniper Networks Junos OS versiones 17.3 anteriores a 17.3R3-S10 en la Serie MX;\u0026#xa0;versiones 17.4 anteriores a 17.4R3-S3 en la Serie MX;\u0026#xa0;versiones 18.1 anteriores a 18.1R3-S11 en la Serie MX;\u0026#xa0;versiones 18.2 anteriores a 18.2R3-S6 en la Serie MX;\u0026#xa0;versiones 18.3 anteriores a 18.3R3-S4 en la Serie MX;\u0026#xa0;versiones 18.4 anteriores a 18.4R3-S6 en la Serie MX;\u0026#xa0;versiones 19.1 anteriores a 19.1R2-S2, 19.1R3-S3 en la Serie MX;\u0026#xa0;versiones 19.2 anteriores a 19.2R3-S1 en la Serie MX;\u0026#xa0;versiones 19.3 anteriores a 19.3R2-S5, 19.3R3-S1 en la Serie MX;\u0026#xa0;versiones 19.4 anteriores a 19.4R3 en la Serie MX;\u0026#xa0;20.1 versiones anteriores a 20.1R2 en la Serie MX;\u0026#xa0;20.2 versiones anteriores a 20.2R2 en la Serie MX"
}
],
"id": "CVE-2021-0205",
"lastModified": "2024-11-21T05:42:11.930",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
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},
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],
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
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"published": "2021-01-15T18:15:14.697",
"references": [
{
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"tags": [
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],
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},
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"cve": "CVE-2021-0205",
"id": "CVE-2021-0205",
"initial_release_date": "2021-01-13T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Junos OS: MX Series: Dynamic filter fails to match IPv6 prefix",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-0205.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.