CVE-2020-1935 (GCVE-0-2020-1935)
Vulnerability from cvelistv5 – Published: 2020-02-24 21:11 – Updated: 2024-08-04 06:53
VLAI
EPSS
VEX
Summary
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
Severity
4.8 (Medium)
CWE
- HTTP Request Smuggling
Assigner
References
19 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache | Apache Tomcat |
Affected:
Apache Tomcat 9.0.0.M1 to 9.0.30
Affected: 8.5.0 to 8.5.50 Affected: 7.0.0 to 7.0.99 |
guessed |
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"lang": "en",
"value": "In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely."
},
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"lang": "es",
"value": "En Apache Tomcat versiones 9.0.0.M1 hasta 9.0.30, versiones 8.5.0 hasta 8.5.50 y versiones 7.0.0 hasta 7.0.99, el c\u00f3digo de an\u00e1lisis del encabezado HTTP utiliz\u00f3 un enfoque para el an\u00e1lisis de fin de l\u00ednea que permiti\u00f3 a algunos encabezados HTTP no v\u00e1lidos ser analizados como v\u00e1lidos. Esto conllev\u00f3 a una posibilidad de Tr\u00e1fico No Autorizado de Peticiones HTTP si Tomcat se encontraba detr\u00e1s de un proxy inverso que manejaba incorrectamente el encabezado Transfer-Encoding no v\u00e1lido en una manera particular. Tal proxy inverso es considerado improbable."
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"id": "CVE-2020-1935",
"lastModified": "2024-11-21T05:11:38.730",
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"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
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"exploitabilityScore": 8.6,
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"value": "In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely."
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},
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],
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},
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},
{
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{
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],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-444"
}
],
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"type": "Primary"
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]
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-04T23:11:56+00:00",
"cve": "CVE-2020-1935",
"id": "CVE-2020-1935",
"initial_release_date": "2020-02-24T00:00:00+00:00",
"product_status:fixed": "349",
"product_status:known_affected": "17",
"product_status:known_not_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-1935.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T02:30:06Z",
"cve": "CVE-2020-1935",
"id": "CVE-2020-1935",
"initial_release_date": "2023-02-15T04:04:12Z",
"product_status:known_affected": "500",
"product_status:known_not_affected": "56",
"product_status:recommended": "410",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-1935",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-1935.json",
"version": "35"
}
}
}
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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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