CVE-2020-13935 (GCVE-0-2020-13935)
Vulnerability from cvelistv5 – Published: 2020-07-14 15:00 – Updated: 2024-08-04 12:32
VLAI
EPSS
VEX
Summary
The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.
Severity
7.5 (High)
CWE
- Denial of Service
Assigner
References
17 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | Apache Tomcat |
Affected:
Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56, 7.0.27 to 7.0.104
|
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"value": "The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service."
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"value": "La longitud de la carga \u00fatil en una trama de WebSocket no fue comprobada correctamente en Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0-M6, versiones 9.0.0.M1 hasta 9.0.36, versiones 8.5.0 hasta 8.5.56 y versiones 7.0.27 hasta 7.0. 104. Las longitudes de carga \u00fatil no v\u00e1lidas podr\u00edan desencadenar un bucle infinito. M\u00faltiples peticiones con longitudes de carga no v\u00e1lidas podr\u00edan conllevar a una denegaci\u00f3n de servicio"
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"id": "CVE-2020-13935",
"lastModified": "2026-08-25T16:28:27.310",
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"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html"
},
{
"source": "security@apache.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20200724-0003/"
},
{
"source": "security@apache.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4448-1/"
},
{
"source": "security@apache.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4596-1/"
},
{
"source": "security@apache.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4727"
},
{
"source": "security@apache.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"source": "security@apache.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"source": "security@apache.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"source": "security@apache.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpujan2021.html"
},
{
"source": "security@apache.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"source": "security@apache.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"source": "security@apache.org",
"tags": [
"Not Applicable",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html"
},
{
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"tags": [
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],
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10332"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50%40%3Cusers.tomcat.apache.org%3E"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://security.netapp.com/advisory/ntap-20200724-0003/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
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},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
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},
{
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"tags": [
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],
"url": "https://www.debian.org/security/2020/dsa-4727"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
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],
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://www.oracle.com/security-alerts/cpujan2021.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
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],
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Not Applicable",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
}
],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-08-04T18:23:03+00:00",
"cve": "CVE-2020-13935",
"id": "CVE-2020-13935",
"initial_release_date": "2020-07-15T00:00:00+00:00",
"product_status:fixed": "407",
"product_status:known_affected": "14",
"product_status:known_not_affected": "22",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "tomcat: multiple requests with invalid payload length in a WebSocket frame could lead to DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-13935.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-02T02:30:59Z",
"cve": "CVE-2020-13935",
"id": "CVE-2020-13935",
"initial_release_date": "2023-02-15T03:58:10Z",
"product_status:known_affected": "394",
"product_status:known_not_affected": "60",
"product_status:recommended": "707",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-13935",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-13935.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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