CVE-2021-33683
Estado: ModificadaMedia (4.3)—
SAP Web Dispatcher and Internet Communication Manager (ICM), versions - KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.73, WEBDISP 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, KERNEL 7.21, 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, process invalid HTTP header. The incorrect handling of the invalid Transfer-Encoding header in a particular manner leads to a possibility of HTTP Request Smuggling attack. An attacker could exploit this vulnerability to bypass web application firewall protection, divert sensitive data such as customer requests, session credentials, etc.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Puntuación base: 4.3
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.55%
- Percentil entre todas las CVEs puntuadas: 44
- Fecha de la puntuación: 3/10/2026
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 (2)
CWE
- CWE-444
- CWE-444
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-33683",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 4,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
"authentication": "SINGLE",
"integrityImpact": "PARTIAL",
"accessComplexity": "LOW",
"availabilityImpact": "NONE",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 8,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV30": [
{
"type": "Secondary",
"source": "cna@sap.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.0",
"baseScore": 5.4,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"integrityImpact": "LOW",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "LOW",
"confidentialityImpact": "LOW"
},
"impactScore": 2.5,
"exploitabilityScore": 2.8
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 4.3,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
"integrityImpact": "LOW",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 1.4,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "cna@sap.com",
"affectedData": [
{
"vendor": "SAP SE",
"product": "SAP Web Dispatcher and Internet Communication Manager",
"versions": [
{
"status": "affected",
"version": "< KRNL32NUC 7.21"
},
{
"status": "affected",
"version": "< 7.21EXT"
},
{
"status": "affected",
"version": "< 7.22"
},
{
"status": "affected",
"version": "< 7.22EXT"
},
{
"status": "affected",
"version": "< KRNL32UC 7.21"
},
{
"status": "affected",
"version": "< KRNL64NUC 7.21"
},
{
"status": "affected",
"version": "< 7.49"
},
{
"status": "affected",
"version": "< KRNL64UC 7.21"
},
{
"status": "affected",
"version": "< 7.53"
},
{
"status": "affected",
"version": "< 7.73"
},
{
"status": "affected",
"version": "< WEBDISP 7.53"
},
{
"status": "affected",
"version": "< 7.77"
},
{
"status": "affected",
"version": "< 7.81"
},
{
"status": "affected",
"version": "< 7.82"
},
{
"status": "affected",
"version": "< 7.83"
},
{
"status": "affected",
"version": "< KERNEL 7.21"
}
]
}
]
}
],
"published": "2021-07-14T12:15:09.237",
"references": [
{
"url": "https://launchpad.support.sap.com/#/notes/3000663",
"tags": [
"Permissions Required"
],
"source": "cna@sap.com"
},
{
"url": "https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=580617506",
"tags": [
"Vendor Advisory"
],
"source": "cna@sap.com"
},
{
"url": "https://launchpad.support.sap.com/#/notes/3000663",
"tags": [
"Permissions Required"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=580617506",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "cna@sap.com",
"description": [
{
"lang": "en",
"value": "CWE-444"
}
]
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-444"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "SAP Web Dispatcher and Internet Communication Manager (ICM), versions - KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.73, WEBDISP 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, KERNEL 7.21, 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, process invalid HTTP header. The incorrect handling of the invalid Transfer-Encoding header in a particular manner leads to a possibility of HTTP Request Smuggling attack. An attacker could exploit this vulnerability to bypass web application firewall protection, divert sensitive data such as customer requests, session credentials, etc."
},
{
"lang": "es",
"value": "SAP Web Dispatcher e Internet Communication Manager (ICM), versiones - KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22EXT, 7. 49, KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.73, WEBDISP 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, KERNEL 7.21, 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, procesan un encabezado HTTP no válido. El manejo incorrecto de la cabecera Transfer-Encoding no válida de manera particular conlleva a una posibilidad de ataque de contrabando de peticiones HTTP. Un atacante podría explotar esta vulnerabilidad para omitir la protección del firewall de la aplicación web y desviar datos confidenciales, como peticiones de clientes, credenciales de sesión, etc"
}
],
"lastModified": "2026-06-17T03:55:01.513",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.8_kernel_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "CEFAE5D3-6729-47E6-8547-EDC127052682"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.21ext:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "5DACDADA-64ED-4AFA-B6A0-A528334D9FD9"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.22:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "668A8F88-F8E1-4D57-83C7-A54C03A9931B"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.22ext:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D3F76E6A-2F27-450C-AAB5-E49A64079CAC"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.49:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0B4A7850-377C-4463-A5D7-07F516FBD74A"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.53:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "47D4D542-2EC2-490B-B4E9-3E7BB8D59B77"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.73:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8E2A20A3-FDA5-4E75-A5F0-362840E5909D"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.77:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E33D9481-3CF6-4AA3-B115-7903AC6DAE25"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.81:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "49FF2A5B-E5F0-4991-9AA3-7CB3B8C62941"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:7.82:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6C2DB75B-321F-4B4C-9398-21817BE7476E"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:krnl32nuc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "769D40FF-AB05-4289-A77C-6FC272F02CDA"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:krnl32uc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "3B209FA5-802F-4A6E-B031-A4A06FE9A01E"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:krnl64nuc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1C32DCE3-2553-4D8F-931C-5CD1F95340C8"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:krnl64uc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "EE9042C8-EDCD-402F-BFFA-70BF6BE53A32"
},
{
"criteria": "cpe:2.3:a:sap:web_dispatcher:webdisp_7.53:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "5481831F-91CC-49DD-A54B-277A6E6D22AE"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.21ext:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "67918BDF-E07C-495D-8408-4C09F0E1F936"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.22:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "47816D78-4FF9-48A6-A759-B174520C0B3D"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.22ext:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "3C852E38-88B7-454D-8011-4D92796E15D3"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.49:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E595F8B1-8F17-411F-BF6E-ED3EB9459938"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.53:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8C949541-3D9C-4253-A43F-0DDA0FA8CF92"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.73:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "13D1D10D-0C54-44A2-9983-6AADDB14BB7E"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.77:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "327D609D-2B85-4719-9F2E-166E9D99D6C3"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.81:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A6ED4FA2-5C99-4F0F-BF06-6DC022BDE65A"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:7.82:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B2E37A8C-494F-4E4C-AE6A-255D1BB19429"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:kernel_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8CE72859-CF21-4095-9262-59385AEAB47F"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:krnl32nuc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "CFA35FF0-0784-4936-9581-8DC9FFC3E206"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:krnl32uc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "92298C45-32BB-4957-92EA-9A9ABFDA892E"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:krnl64nuc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "55623101-2144-45CB-B612-F449A160F7F2"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:krnl64uc_7.21:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C0410689-F1C7-4A08-9D75-6BF742DC2731"
},
{
"criteria": "cpe:2.3:a:sap:internet_communication_manager:webdisp_7.53:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9A364314-7520-43F0-B4EA-B8EEBB30A3D3"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "cna@sap.com"
}