CVE-2020-17527 (GCVE-0-2020-17527)
Vulnerability from cvelistv5 – Published: 2020-12-03 18:30 – Updated: 2025-02-13 16:27
VLAI
EPSS
VEX
Title
Apache Tomcat: Request header mix-up between HTTP/2 streams
Summary
While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.
Severity
7.5 (High)
CWE
- CWE-200 - Information Exposure
Assigner
References
24 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
Affected:
Apache Tomcat 10 10.0.0-M1 to 10.0.0-M9
Affected: Apache Tomcat 9 9.0.0-M1 to 9.0.39 Affected: Apache Tomcat 8.5 8.5.0 to 8.5.59 |
guessed |
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"name": "[guacamole-issues] 20201206 [jira] [Created] (GUACAMOLE-1229) Fix in Dockerhub for latest CVE-2020-17527",
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{
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{
"name": "DSA-4835",
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{
"name": "https://www.oracle.com/security-alerts/cpuApr2021.html",
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"name": "https://security.netapp.com/advisory/ntap-20201210-0003/",
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"source": {
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"dateReserved": "2020-08-12T00:00:00.000Z",
"dateUpdated": "2025-02-13T16:27:36.405Z",
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"date": "2026-09-16",
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"percentile": "0.97771"
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"descriptions": "[{\"lang\": \"en\", \"value\": \"While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.\"}, {\"lang\": \"es\", \"value\": \"Al investigar el error 64830, se detect\\u00f3 que Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0-M9, versiones 9.0.0-M1 hasta 9.0.39 y versiones 8.5.0 hasta 8.5.59, podr\\u00eda reutilizar un valor de encabezado de petici\\u00f3n HTTP de la transmisi\\u00f3n anterior recibida en una conexi\\u00f3n HTTP/2 para la petici\\u00f3n asociada con la transmisi\\u00f3n posterior.\u0026#xa0;Si bien esto probablemente conllevar\\u00eda a un error y al cierre de la conexi\\u00f3n HTTP/2, es posible que la informaci\\u00f3n podr\\u00eda filtrarse entre peticiones\"}]",
"id": "CVE-2020-17527",
"lastModified": "2024-11-21T05:08:17.910",
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"published": "2020-12-03T19:15:12.200",
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"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"security@apache.org\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-200\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-200\"}]}]"
},
"microsoft_vex": {
"current_release_date": "2025-10-01T23:11:04.000Z",
"cve": "CVE-2020-17527",
"id": "msrc_CVE-2020-17527",
"initial_release_date": "2020-12-02T00:00:00.000Z",
"product_status:fixed": "2",
"product_status:known_affected": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Apache Tomcat: Request header mix-up between HTTP/2 streams",
"url": "https://msrc.microsoft.com/csaf/vex/2020/msrc_cve-2020-17527.json",
"version": "1"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2020-17527\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2020-12-03T19:15:12.200\",\"lastModified\":\"2024-11-21T05:08:17.910\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.\"},{\"lang\":\"es\",\"value\":\"Al investigar el error 64830, se detect\u00f3 que Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0-M9, versiones 9.0.0-M1 hasta 9.0.39 y versiones 8.5.0 hasta 8.5.59, podr\u00eda reutilizar un valor de encabezado de petici\u00f3n HTTP de la transmisi\u00f3n anterior recibida en una conexi\u00f3n HTTP/2 para la petici\u00f3n asociada con la transmisi\u00f3n posterior.\u0026#xa0;Si bien esto probablemente conllevar\u00eda a un error y al cierre de la conexi\u00f3n HTTP/2, es posible que la informaci\u00f3n podr\u00eda filtrarse entre 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:44:55+00:00",
"cve": "CVE-2020-17527",
"id": "CVE-2020-17527",
"initial_release_date": "2020-12-03T00:00:00+00:00",
"product_status:fixed": "31",
"product_status:known_affected": "7",
"product_status:known_not_affected": "38",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "tomcat: HTTP/2 request header mix-up",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-17527.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-05T17:13:55Z",
"cve": "CVE-2020-17527",
"id": "CVE-2020-17527",
"initial_release_date": "2023-02-15T03:55:30Z",
"product_status:known_affected": "394",
"product_status:known_not_affected": "151",
"product_status:recommended": "544",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-17527",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-17527.json",
"version": "38"
}
}
}
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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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