FKIE_CVE-2025-20340
Vulnerability from fkie_nvd - Published: 2025-09-10 16:15 - Updated: 2026-06-17 08:41
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."
}
],
"id": "CVE-2025-20340",
"lastModified": "2026-06-17T08:41:30.040",
"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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