CVE-2021-33037 (GCVE-0-2021-33037)
Vulnerability from cvelistv5 – Published: 2021-07-12 14:55 – Updated: 2024-08-03 23:42
VLAI
EPSS
VEX
Title
Incorrect Transfer-Encoding handling with HTTP/1.0
Summary
Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
Severity
5.3 (Medium)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
Affected:
Apache Tomcat 10 10.0.0-M1 to 10.0.6
Affected: Apache Tomcat 9 9.0.0.M1 to 9.0.46 Affected: Apache Tomcat 8 8.5.0 to 8.5.66 |
guessed |
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"descriptions": "[{\"lang\": \"en\", \"value\": \"Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.\"}, {\"lang\": \"es\", \"value\": \"Apache Tomcat versiones 10.0.0-M1 hasta 10.0.6, versiones 9.0.0.M1 hasta 9.0.46 y versiones 8.5.0 hasta 8.5.66, no analizaban correctamente el encabezado de petici\\u00f3n HTTP transfer-encoding en algunas circunstancias, conllevando a la posibilidad de contrabando de peticiones cuando se usaba con un proxy inverso. Espec\\u00edficamente: - Tomcat ignoraba incorrectamente el encabezado de codificaci\\u00f3n de transferencia si el cliente declaraba que s\\u00f3lo aceptar\\u00eda una respuesta HTTP/1.0; - Tomcat honraba la codificaci\\u00f3n de identificaci\\u00f3n; y - Tomcat no se aseguraba de que, si estaba presente, la codificaci\\u00f3n en trozos fuera la codificaci\\u00f3n final\"}]",
"id": "CVE-2021-33037",
"lastModified": "2024-11-21T06:08:10.320",
"metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N\", \"baseScore\": 5.3, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 1.4}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:P/A:N\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
"published": "2021-07-12T15:15:08.400",
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"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"security@apache.org\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-444\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-444\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2021-33037\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2021-07-12T15:15:08.400\",\"lastModified\":\"2026-08-25T16:28:27.310\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.\"},{\"lang\":\"es\",\"value\":\"Apache Tomcat versiones 10.0.0-M1 hasta 10.0.6, versiones 9.0.0.M1 hasta 9.0.46 y versiones 8.5.0 hasta 8.5.66, no analizaban correctamente el encabezado de petici\u00f3n HTTP transfer-encoding en algunas circunstancias, conllevando a la posibilidad de contrabando de peticiones cuando se usaba con un proxy inverso. Espec\u00edficamente: - Tomcat ignoraba incorrectamente el encabezado de codificaci\u00f3n de transferencia si el cliente declaraba que s\u00f3lo aceptar\u00eda una respuesta HTTP/1.0; - Tomcat honraba la codificaci\u00f3n de identificaci\u00f3n; y - Tomcat no se aseguraba de que, si estaba presente, la codificaci\u00f3n en trozos fuera la codificaci\u00f3n final\"}],\"affected\":[{\"source\":\"security@apache.org\",\"affectedData\":[{\"vendor\":\"Apache Software Foundation\",\"product\":\"Apache Tomcat\",\"versions\":[{\"version\":\"Apache Tomcat 10 10.0.0-M1 to 10.0.6\",\"status\":\"affected\"},{\"version\":\"Apache Tomcat 9 9.0.0.M1 to 9.0.46\",\"status\":\"affected\"},{\"version\":\"Apache Tomcat 8 8.5.0 to 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Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:39:59+00:00",
"cve": "CVE-2021-33037",
"id": "CVE-2021-33037",
"initial_release_date": "2021-07-12T00:00:00+00:00",
"product_status:fixed": "39",
"product_status:known_affected": "3",
"product_status:known_not_affected": "32",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "tomcat: HTTP request smuggling when used with a reverse proxy",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-33037.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-04T00:46:05Z",
"cve": "CVE-2021-33037",
"id": "CVE-2021-33037",
"initial_release_date": "2023-02-15T03:40:40Z",
"product_status:known_affected": "423",
"product_status:recommended": "544",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-33037",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-33037.json",
"version": "40"
}
}
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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