FKIE_CVE-2025-20340
Vulnerability from fkie_nvd - Published: 2025-09-10 16:15 - Updated: 2026-09-26 00:10
Severity
Summary
A vulnerability in the Address Resolution Protocol (ARP) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a broadcast storm, leading to a denial of service (DoS) condition on an affected device.
This vulnerability is due to how Cisco IOS XR Software processes a high, sustained rate of ARP traffic hitting the management interface. Under certain conditions, an attacker could exploit this vulnerability by sending an excessive amount of traffic to the management interface of an affected device, overwhelming its ARP processing capabilities. A successful exploit could result in degraded device performance, loss of management connectivity, and complete unresponsiveness of the system, leading to a DoS condition.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "Cisco IOS XR Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "6.5.3"
},
{
"status": "affected",
"version": "6.5.29"
},
{
"status": "affected",
"version": "6.5.1"
},
{
"status": "affected",
"version": "6.6.1"
},
{
"status": "affected",
"version": "6.5.2"
},
{
"status": "affected",
"version": "6.5.92"
},
{
"status": "affected",
"version": "6.5.15"
},
{
"status": "affected",
"version": "6.6.2"
},
{
"status": "affected",
"version": "7.0.1"
},
{
"status": "affected",
"version": "6.6.25"
},
{
"status": "affected",
"version": "6.5.26"
},
{
"status": "affected",
"version": "6.6.11"
},
{
"status": "affected",
"version": "6.5.25"
},
{
"status": "affected",
"version": "6.5.28"
},
{
"status": "affected",
"version": "6.5.93"
},
{
"status": "affected",
"version": "6.6.12"
},
{
"status": "affected",
"version": "6.5.90"
},
{
"status": "affected",
"version": "7.0.0"
},
{
"status": "affected",
"version": "7.1.1"
},
{
"status": "affected",
"version": "7.0.90"
},
{
"status": "affected",
"version": "6.6.3"
},
{
"status": "affected",
"version": "6.7.1"
},
{
"status": "affected",
"version": "7.0.2"
},
{
"status": "affected",
"version": "7.1.15"
},
{
"status": "affected",
"version": "7.2.0"
},
{
"status": "affected",
"version": "7.2.1"
},
{
"status": "affected",
"version": "7.1.2"
},
{
"status": "affected",
"version": "6.7.2"
},
{
"status": "affected",
"version": "7.0.11"
},
{
"status": "affected",
"version": "7.0.12"
},
{
"status": "affected",
"version": "7.0.14"
},
{
"status": "affected",
"version": "7.1.25"
},
{
"status": "affected",
"version": "6.6.4"
},
{
"status": "affected",
"version": "7.2.12"
},
{
"status": "affected",
"version": "7.3.1"
},
{
"status": "affected",
"version": "7.1.3"
},
{
"status": "affected",
"version": "6.7.3"
},
{
"status": "affected",
"version": "7.4.1"
},
{
"status": "affected",
"version": "7.2.2"
},
{
"status": "affected",
"version": "6.7.4"
},
{
"status": "affected",
"version": "6.5.31"
},
{
"status": "affected",
"version": "7.3.15"
},
{
"status": "affected",
"version": "7.3.16"
},
{
"status": "affected",
"version": "6.8.1"
},
{
"status": "affected",
"version": "7.4.15"
},
{
"status": "affected",
"version": "6.5.32"
},
{
"status": "affected",
"version": "7.3.2"
},
{
"status": "affected",
"version": "7.5.1"
},
{
"status": "affected",
"version": "7.4.16"
},
{
"status": "affected",
"version": "7.3.27"
},
{
"status": "affected",
"version": "7.6.1"
},
{
"status": "affected",
"version": "7.5.2"
},
{
"status": "affected",
"version": "7.8.1"
},
{
"status": "affected",
"version": "7.6.15"
},
{
"status": "affected",
"version": "7.5.12"
},
{
"status": "affected",
"version": "7.8.12"
},
{
"status": "affected",
"version": "7.3.3"
},
{
"status": "affected",
"version": "7.7.1"
},
{
"status": "affected",
"version": "6.8.2"
},
{
"status": "affected",
"version": "7.3.4"
},
{
"status": "affected",
"version": "7.4.2"
},
{
"status": "affected",
"version": "6.7.35"
},
{
"status": "affected",
"version": "6.9.1"
},
{
"status": "affected",
"version": "7.6.2"
},
{
"status": "affected",
"version": "7.5.3"
},
{
"status": "affected",
"version": "7.7.2"
},
{
"status": "affected",
"version": "6.9.2"
},
{
"status": "affected",
"version": "7.9.1"
},
{
"status": "affected",
"version": "7.10.1"
},
{
"status": "affected",
"version": "7.8.2"
},
{
"status": "affected",
"version": "7.5.4"
},
{
"status": "affected",
"version": "6.5.33"
},
{
"status": "affected",
"version": "7.8.22"
},
{
"status": "affected",
"version": "7.7.21"
},
{
"status": "affected",
"version": "7.9.2"
},
{
"status": "affected",
"version": "7.3.5"
},
{
"status": "affected",
"version": "7.5.5"
},
{
"status": "affected",
"version": "7.11.1"
},
{
"status": "affected",
"version": "7.9.21"
},
{
"status": "affected",
"version": "7.10.2"
},
{
"status": "affected",
"version": "24.1.1"
},
{
"status": "affected",
"version": "7.6.3"
},
{
"status": "affected",
"version": "7.3.6"
},
{
"status": "affected",
"version": "7.5.52"
},
{
"status": "affected",
"version": "7.11.2"
},
{
"status": "affected",
"version": "24.2.1"
},
{
"status": "affected",
"version": "24.1.2"
},
{
"status": "affected",
"version": "24.2.11"
},
{
"status": "affected",
"version": "24.3.1"
},
{
"status": "affected",
"version": "24.4.1"
},
{
"status": "affected",
"version": "24.2.2"
},
{
"status": "affected",
"version": "7.8.23"
},
{
"status": "affected",
"version": "7.11.21"
},
{
"status": "affected",
"version": "24.2.20"
},
{
"status": "affected",
"version": "24.3.2"
},
{
"status": "affected",
"version": "24.4.10"
},
{
"status": "affected",
"version": "6.5.35"
},
{
"status": "affected",
"version": "25.1.1"
},
{
"status": "affected",
"version": "24.4.2"
},
{
"status": "affected",
"version": "24.3.20"
},
{
"status": "affected",
"version": "24.4.15"
},
{
"status": "affected",
"version": "6.5.351"
},
{
"status": "affected",
"version": "24.3.30"
},
{
"status": "affected",
"version": "6.5.352"
},
{
"status": "affected",
"version": "24.4.30"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Address Resolution Protocol (ARP) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a broadcast storm, leading to a denial of service (DoS) condition on an affected device.\u0026nbsp;\r\n\r\nThis vulnerability is due to how Cisco IOS XR Software processes a high, sustained rate of ARP traffic hitting the management interface. Under certain conditions, an attacker could exploit this vulnerability by sending an excessive amount of traffic to the management interface of an affected device, overwhelming its ARP processing capabilities. A successful exploit could result in degraded device performance, loss of management connectivity, and complete unresponsiveness of the system, leading to a DoS condition."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la implementaci\u00f3n del Protocolo de Resoluci\u00f3n de Direcciones (ARP) de Cisco IOS XR Software podr\u00eda permitir a un atacante no autenticado y adyacente desencadenar una tormenta de difusi\u00f3n, lo que llevar\u00eda a una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a c\u00f3mo Cisco IOS XR Software procesa una tasa alta y sostenida de tr\u00e1fico ARP que llega a la interfaz de gesti\u00f3n. Bajo ciertas condiciones, un atacante podr\u00eda explotar esta vulnerabilidad enviando una cantidad excesiva de tr\u00e1fico a la interfaz de gesti\u00f3n de un dispositivo afectado, sobrecargando sus capacidades de procesamiento ARP. Un exploit exitoso podr\u00eda resultar en un rendimiento degradado del dispositivo, p\u00e9rdida de conectividad de gesti\u00f3n y una falta total de respuesta del sistema, lo que llevar\u00eda a una condici\u00f3n de DoS."
}
],
"id": "CVE-2025-20340",
"lastModified": "2026-09-26T00:10:00.127",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 4.0,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-20340",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-09-10T18:30:55.478853Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-09-10T16:15:36.340",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-arp-storm-EjUU55yM"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
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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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