CVE-2021-34736
A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Software could allow an unauthenticated, remote attacker to cause the web-based management interface to unexpectedly restart. The vulnerability is due to insufficient input validation on the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause the interface to restart, resulting in a denial of service (DoS) condition.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.27%
- Percentil entre todas las CVEs puntuadas: 69
- 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
- CWE-20
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-34736",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-34736",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-11-07T21:44:36.610487Z"
}
}
],
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 5,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 10,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.3,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/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": 3.9
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "psirt@cisco.com",
"affectedData": [
{
"vendor": "Cisco",
"product": "Cisco Unified Computing System (Managed)",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
]
}
],
"published": "2021-10-21T03:15:06.890",
"references": [
{
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-imc-gui-dos-TZjrFyZh",
"tags": [
"Vendor Advisory"
],
"source": "psirt@cisco.com"
},
{
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-imc-gui-dos-TZjrFyZh",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-20"
}
]
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-20"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Software could allow an unauthenticated, remote attacker to cause the web-based management interface to unexpectedly restart. The vulnerability is due to insufficient input validation on the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause the interface to restart, resulting in a denial of service (DoS) condition."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la interfaz de administración basada en web de Cisco Integrated Management Controller (IMC) Software podría permitir a un atacante remoto no autenticado causar el reinicio inesperado de la interfaz de administración basada en web. La vulnerabilidad es debido a que la interfaz de administración basada en web no comprueba suficientemente las entradas. Un atacante podría aprovechar esta vulnerabilidad mediante el envío de una petición HTTP diseñada a un dispositivo afectado. Una explotación con éxito podría permitir al atacante causar el reinicio de la interfaz, resultando en una condición de denegación de servicio (DoS)"
}
],
"lastModified": "2026-06-17T03:56:27.483",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:cisco:unified_computing_system:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "12A905D0-ACBA-453C-A517-CEB0D98E836C",
"versionEndExcluding": "4.1\\(2g\\)"
},
{
"criteria": "cpe:2.3:a:cisco:unified_computing_system:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2988EA7D-D1B7-4A45-A7E1-F4CDCE8A449B",
"versionEndExcluding": "4.2\\(1b\\)",
"versionStartIncluding": "4.2"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:cisco:ucs_c125_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "ADD4A429-F168-460B-A964-8F1BD94C6387"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c22_m3:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "DE87B6DD-FDE4-4484-84C7-EAF383EB6BAC"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c220_m3:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "5368DBDD-B482-4705-A186-6D5B5B21B754"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c220_m4:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "CD45BB8A-BC47-4DFB-9027-93ACF0DA302B"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c220_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "855E1346-BACC-4485-9534-7C830FCFD54B"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c225_m6:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A9C38B65-9A77-40BF-BE77-2B307A0AFC1D"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c24_m3:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "9403C407-8BE9-416E-94C0-3CB6F732C592"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c240_m3:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "1CB75EF7-5889-4D6F-A488-F1EB30596F9F"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c240_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "F262ADAB-74DC-466B-983A-C49E4BAC22C0"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c240_sd_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D9768750-2981-4F7B-82B5-8BB64FD5AAD5"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c245_m6:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7B319520-A217-4070-ABAF-29DCE6EDB6D2"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c260_m2:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A6B63849-1831-4564-9F9C-BDBDA267E9AF"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c3160:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "9E1C3AF7-DF08-494D-B3FA-001CC9114DC2"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c3260:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "22B85A56-2058-42C3-87EF-F9A7DD4726B1"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c420_m3:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "CF2C12B1-A75B-450A-BD31-53EF15F1F4A0"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c4200:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "BD25964B-08B7-477E-A507-5FE5EE7CD286"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c460_m2:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "1311C886-01AA-45DA-9479-0287C935DE91"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c460_m4:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "E6B4CF9E-A757-4F4B-931A-538FC2F5331A"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c480_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "0D0B0FA5-996F-4F25-8AAB-603CB46175F9"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c480_ml_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "9E829EF2-3BFE-48CD-A0CE-8DFA20440EF7"
},
{
"criteria": "cpe:2.3:h:cisco:ucs_c890_m5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "87A68188-3C0E-422A-A674-0E8BF18E7091"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:cisco:unified_computing_system:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4DAF0295-8C01-4C4D-842E-46387B239C81",
"versionEndExcluding": "4.1\\(3e\\)"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:cisco:ucs_s3260:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "2FDC8A69-0914-44C1-8AEA-262E0A285C81"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "psirt@cisco.com"
}