cve-2025-20241
Vulnerability from cvelistv5
Published
2025-08-27 16:23
Modified
2025-08-27 18:18
Severity ?
EPSS score ?
Summary
Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol <TBD> Denial of Service Vulnerability
References
Impacted products
| ▼ | Vendor | Product |
|---|---|---|
| Cisco | Cisco NX-OS Software |
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"id": "CVE-2025-20241",
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"Automatable": "no"
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"Technical Impact": "partial"
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"role": "CISA Coordinator",
"timestamp": "2025-08-27T18:18:19.522793Z",
"version": "2.0.3"
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"status": "affected",
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{
"status": "affected",
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{
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"version": "6.0(2)A8(7)"
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{
"status": "affected",
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{
"status": "affected",
"version": "6.0(2)A8(11a)"
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{
"status": "affected",
"version": "7.0(3)I4(8z)"
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{
"status": "affected",
"version": "7.0(3)I4(9)"
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"status": "affected",
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{
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"version": "9.2(2)"
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"version": "7.0(3)I4(8b)"
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"version": "6.0(2)A8(3)"
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"version": "7.0(3)I4(6t)"
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"version": "7.0(3)I5(3a)"
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{
"status": "affected",
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"version": "7.0(3)I7(5)"
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{
"status": "affected",
"version": "7.0(3)F3(3a)"
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{
"status": "affected",
"version": "6.0(2)A8(4)"
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{
"status": "affected",
"version": "7.0(3)I4(8a)"
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{
"status": "affected",
"version": "7.0(3)F3(2)"
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{
"status": "affected",
"version": "7.0(3)I4(4)"
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{
"status": "affected",
"version": "7.0(3)I7(1)"
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{
"status": "affected",
"version": "7.0(3)IA7(2)"
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{
"status": "affected",
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"version": "7.0(3)I7(9)"
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"version": "9.3(6)"
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{
"status": "affected",
"version": "10.1(2)"
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"status": "affected",
"version": "10.1(1)"
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{
"status": "affected",
"version": "9.3(5w)"
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{
"status": "affected",
"version": "9.3(7)"
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"version": "9.3(7k)"
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{
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"version": "9.3(9)"
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"version": "10.1(2t)"
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"version": "10.2(3)"
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"version": "10.2(3t)"
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{
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"version": "9.3(10)"
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"version": "10.2(2a)"
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"version": "10.3(1)"
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"version": "10.2(4)"
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"version": "10.3(2)"
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{
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{
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"version": "10.3(3)"
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"version": "10.2(5)"
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"status": "affected",
"version": "9.3(12)"
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"status": "affected",
"version": "10.2(3v)"
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"status": "affected",
"version": "10.4(1)"
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{
"status": "affected",
"version": "10.3(99w)"
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"status": "affected",
"version": "10.2(6)"
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"status": "affected",
"version": "10.3(3w)"
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"status": "affected",
"version": "10.3(99x)"
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"status": "affected",
"version": "10.3(3o)"
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"version": "10.3(4)"
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"version": "10.3(3p)"
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"status": "affected",
"version": "10.5(1)"
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"status": "affected",
"version": "10.2(8)"
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"status": "affected",
"version": "10.3(3r)"
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"status": "affected",
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"status": "affected",
"version": "9.3(14)"
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"status": "affected",
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"version": "10.5(2)"
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],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.\r\n\r\nThis vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"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"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-733",
"description": "Compiler Optimization Removal or Modification of Security-critical Code",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-08-27T16:23:55.242Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-n39k-isis-dos-JhJA8Rfx",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n39k-isis-dos-JhJA8Rfx"
}
],
"source": {
"advisory": "cisco-sa-n39k-isis-dos-JhJA8Rfx",
"defects": [
"CSCwn49153"
],
"discovery": "INTERNAL"
},
"title": "Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol \u003cTBD\u003e Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2025-20241",
"datePublished": "2025-08-27T16:23:55.242Z",
"dateReserved": "2024-10-10T19:15:13.238Z",
"dateUpdated": "2025-08-27T18:18:32.250Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-20241\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2025-08-27T17:15:34.650\",\"lastModified\":\"2025-08-29T16:24:09.860\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.\\r\\n\\r\\nThis vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.\\r\\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad en la funci\u00f3n de sistema intermedio a sistema intermedio (IS-IS) del software Cisco NX-OS para los switches Cisco Nexus de las series 3000 y 9000 en modo NX-OS independiente podr\u00eda permitir que un atacante adyacente no autenticado provoque el reinicio inesperado del proceso IS-IS, lo que podr\u00eda provocar la recarga del dispositivo afectado. Esta vulnerabilidad se debe a una validaci\u00f3n de entrada insuficiente al analizar un paquete IS-IS de entrada. Un atacante podr\u00eda explotar esta vulnerabilidad enviando un paquete IS-IS manipulado a un dispositivo afectado. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante provocar el reinicio inesperado del proceso IS-IS, lo que podr\u00eda provocar la recarga del dispositivo afectado y provocar una denegaci\u00f3n de servicio (DoS). Nota: El protocolo IS-IS es un protocolo de enrutamiento. Para explotar esta vulnerabilidad, un atacante debe estar adyacente a la capa 2 del dispositivo afectado.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":4.0}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-733\"}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n39k-isis-dos-JhJA8Rfx\",\"source\":\"psirt@cisco.com\"}]}}"
}
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.