CVE-2021-1367
Estado: ModificadaMedia (4.3)—
A vulnerability in the Protocol Independent Multicast (PIM) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted PIM packet to an affected device. A successful exploit could allow the attacker to cause a traffic loop, resulting in a DoS condition.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Puntuación base: 4.3
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.40%
- Percentil entre todas las CVEs puntuadas: 33
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-20
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-1367",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-1367",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-11-08T20:48:20.897429Z"
}
}
],
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 2.9,
"accessVector": "ADJACENT_NETWORK",
"vectorString": "AV:A/AC:M/Au:N/C:N/I:N/A:P",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "MEDIUM",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "LOW",
"obtainAllPrivilege": false,
"exploitabilityScore": 5.5,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 4.3,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "LOW",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 1.4,
"exploitabilityScore": 2.8
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 4.3,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "LOW",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 1.4,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "psirt@cisco.com",
"affectedData": [
{
"vendor": "Cisco",
"product": "Cisco NX-OS Software",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
]
}
],
"published": "2021-02-24T20:15:13.363",
"references": [
{
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-dos-Y8SjMz4",
"tags": [
"Vendor Advisory"
],
"source": "psirt@cisco.com"
},
{
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-dos-Y8SjMz4",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-20"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Protocol Independent Multicast (PIM) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted PIM packet to an affected device. A successful exploit could allow the attacker to cause a traffic loop, resulting in a DoS condition."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la funcionalidad Protocol Independent Multicast (PIM) del software Cisco NX-OS, podría permitir a un atacante adyacente no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad es debido a una comprobación de entrada insuficiente. Un atacante podría explotar esta vulnerabilidad mediante el envío de un paquete PIM diseñado a un dispositivo afectado. Una explotación con éxito podría permitir al atacante causar un bucle de tráfico, lo que resultaría en una condición DoS"
}
],
"lastModified": "2026-06-17T03:31:36.527",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:cisco:nx-os:9.3\\(5\\):*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2A2F42DB-B22B-4880-BA73-D0E0295190DF"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:cisco:nexus_9000v_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "33600D17-FBBD-4314-AAE6-95E78A5F32EB"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_92160yc-x_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "44BE8368-6B37-4C2C-980F-412CA6E87A2C"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_92300yc_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "3AA5389A-8AD1-476E-983A-54DF573C30F5"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_92304qc_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "C1B1A8F1-45B1-4E64-A254-7191FA93CB6D"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_92348gc-x_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D2749521-2922-4F15-9467-AFD8D9F15C91"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9236c_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "DB2FFD26-8255-4351-8594-29D2AEFC06EF"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9272q_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "61E10975-B47E-4F4D-8096-AEC7B7733612"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93108tc-ex-24_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "902F5C0B-F379-464C-8DED-C166004FE97B"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93108tc-ex_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "2C67B7A6-9BB2-41FC-8FA3-8D0DF67CBC68"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93108tc-fx-24:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "C47F6BF9-2ADB-41A4-8D7D-8BB00141BB23"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93108tc-fx_switch:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "75507216-258C-4501-AD98-CC9BB2EA5E14"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "07DE6F63-2C7D-415B-8C34-01EC05C062F3"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93128tx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "F423E45D-A6DD-4305-9C6A-EAB26293E53A"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9316d-gx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "102F91CD-DFB6-43D4-AE5B-DA157A696230"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180lc-ex:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "E952A96A-0F48-4357-B7DD-1127D8827650"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "F70D81F1-8B12-4474-9060-B4934D8A3873"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180yc-ex-24:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "5394DE31-3863-4CA9-B7B1-E5227183100D"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7349D69B-D8FA-4462-AA28-69DD18A652D9"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180yc-fx-24:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "FE4BB834-2C00-4384-A78E-AF3BCDDC58AF"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180yc-fx3:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "B0D30D52-837F-4FDA-B8E5-A9066E9C6D2F"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93180yc-fx3s:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7CE49B45-F2E9-491D-9C29-1B46E9CE14E2"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93216tc-fx2:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "B1CC5F78-E88B-4B82-9E3E-C73D3A49DE26"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93240yc-fx2:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "91231DC6-2773-4238-8C14-A346F213B5E5"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9332c:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "2DF88547-BAF4-47B0-9F60-80A30297FCEB"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9332pq:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "113772B6-E9D2-4094-9468-3F4E1A87D07D"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93360yc-fx2:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "C45A38D6-BED6-4FEF-AD87-A1E813695DE0"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "F1FC2B1F-232E-4754-8076-CC82F3648730"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9336c-fx2-e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7CDD27C9-5EAF-4956-8AB7-740C84C9D4FC"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9336pq:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "5F1127D2-12C0-454F-91EF-5EE334070D06"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "17C7E3DB-8E1A-47AD-B1C5-61747DC0CFB9"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_93600cd-gx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "2CF467E2-4567-426E-8F48-39669E0F514C"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9364c:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "63842B25-8C32-4988-BBBD-61E9CB09B4F3"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9364c-gx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "68EA1FEF-B6B6-49FE-A0A4-5387F76303F8"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9372px:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "4364ADB9-8162-451D-806A-B98924E6B2CF"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "B53BCB42-ED61-4FCF-8068-CB467631C63C"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9372tx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "49E0371B-FDE2-473C-AA59-47E1269D050F"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "489D11EC-5A18-4F32-BC7C-AC1FCEC27222"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9396px:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "1BC5293E-F2B4-46DC-85DA-167EA323FCFD"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9396tx:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "EA022E77-6557-4A33-9A3A-D028E2DB669A"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9504:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "768BE390-5ED5-48A7-9E80-C4DE8BA979B1"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9508:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "DDC2F709-AFBE-48EA-A3A2-DA1134534FB6"
},
{
"criteria": "cpe:2.3:h:cisco:nexus_9516:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7E02DC82-0D26-436F-BA64-73C958932B0A"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "psirt@cisco.com"
}