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CVE-2021-31353 (GCVE-0-2021-31353)

Vulnerability from cvelistv5 – Published: 2021-10-19 18:16 – Updated: 2024-09-16 17:37
VLAI
Title
Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update
Summary
An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
URL Tags
https://kb.juniper.net/JSA11218 x_refsource_CONFIRM
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Unaffected: unspecified , < 19.3R3-S2 (custom)
Affected: 19.3R3-S2
Affected: 19.4R3-S3
Unaffected: 20.1R1 , < 20.1* (custom)
Unaffected: 20.2 , < 20.2R2-S3 (custom)
Unaffected: 20.3 , < 20.3R2 (custom)
Unaffected: 20.4 , < 20.4R2 (custom)
Affected: 21.1 , < 21.1R2 (custom)
guessed Create a notification for this product.
Juniper Networks Junos OS Evolved Affected: unspecified , < 20.4R2-S3-EVO, 20.4R3-EVO (custom)
Affected: 21.1-EVO , < 21.1R2-EVO (custom)
Affected: 21.2-EVO , < 21.2R2-EVO (custom)
guessed Create a notification for this product.
Date Public
2021-10-13 00:00
Show details on NVD website
To clipboard 

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.\"}, {\"lang\": \"es\", \"value\": \"Una vulnerabilidad de administraci\\u00f3n inapropiada de condiciones excepcionales en Juniper Networks Junos OS y Junos OS Evolved permite a un atacante inyectar una actualizaci\\u00f3n BGP espec\\u00edfica, causando el bloqueo y el reinicio del demonio del protocolo de enrutamiento (RPD), conllevando a una Denegaci\\u00f3n de Servicio (DoS). Si se sigue recibiendo y procesando la actualizaci\\u00f3n BGP, ser\\u00e1 creada una condici\\u00f3n de Denegaci\\u00f3n de Servicio (DoS) sostenida. Este problema afecta a versiones muy espec\\u00edficas de Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versiones 20.2R2-S3 y posteriores, anteriores a 20.2R3-S2; 20.3 versiones 20.3R2 y posteriores, anteriores a 20.3R3; 20.4 versiones 20.4R2 y posteriores, anteriores a 20.4R3; versiones 21.1 anteriores a 21.1R2. Juniper Networks Junos OS 20.1 no est\\u00e1 afectado por este problema. Este problema tambi\\u00e9n afecta a Juniper Networks Junos OS Evolved: Todas las versiones anteriores a 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versiones anteriores a 21.1R2-EVO; 21.2-EVO versiones anteriores a 21.2R2-EVO\"}]",
      "id": "CVE-2021-31353",
      "lastModified": "2024-11-21T06:05:29.003",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"sirt@juniper.net\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:N/A:P\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-10-19T19:15:08.720",
      "references": "[{\"url\": \"https://kb.juniper.net/JSA11218\", \"source\": \"sirt@juniper.net\", \"tags\": [\"Exploit\", \"Mitigation\", \"Vendor Advisory\"]}, {\"url\": \"https://kb.juniper.net/JSA11218\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Mitigation\", \"Vendor Advisory\"]}]",
      "sourceIdentifier": "sirt@juniper.net",
      "vulnStatus": "Modified",
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-31353\",\"sourceIdentifier\":\"sirt@juniper.net\",\"published\":\"2021-10-19T19:15:08.720\",\"lastModified\":\"2024-11-21T06:05:29.003\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de administraci\u00f3n inapropiada de condiciones excepcionales en Juniper Networks Junos OS y Junos OS Evolved permite a un atacante inyectar una actualizaci\u00f3n BGP espec\u00edfica, causando el bloqueo y el reinicio del demonio del protocolo de enrutamiento (RPD), conllevando a una Denegaci\u00f3n de Servicio (DoS). Si se sigue recibiendo y procesando la actualizaci\u00f3n BGP, ser\u00e1 creada una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS) sostenida. 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Este problema tambi\u00e9n afecta a Juniper Networks Junos OS Evolved: Todas las versiones anteriores a 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versiones anteriores a 21.1R2-EVO; 21.2-EVO versiones anteriores a 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Advisory\"]},{\"url\":\"https://kb.juniper.net/JSA11218\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mitigation\",\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:08:37+00:00",
      "cve": "CVE-2021-31353",
      "id": "CVE-2021-31353",
      "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 and Junos OS Evolved: RPD core upon receipt of specific BGP update",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-31353.json",
      "version": "3"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.