CVE-2020-11996 (GCVE-0-2020-11996)
Vulnerability from cvelistv5 – Published: 2020-06-26 16:27 – Updated: 2024-08-04 11:48
VLAI
EPSS
VEX
Summary
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
Severity
7.5 (High)
CWE
- Denial of Service
Assigner
References
24 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache | Apache Tomcat |
Affected:
10.0.0-M1 to 10.0.0-M5
Affected: 9.0.0.M1 to 9.0.35 Affected: 8.5.0 to 8.5.55 |
guessed |
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"value": "A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive."
},
{
"lang": "es",
"value": "Una secuencia especialmente dise\u00f1ada de peticiones HTTP/2 enviadas a Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0-M5, versiones 9.0.0.M1 hasta 9.0.35 y versiones 8.5.0 hasta 8.5.55, podr\u00eda desencadenar un uso elevado de la CPU por varios segundos. Si se hacen una cantidad suficiente de tales peticiones en conexiones HTTP/2 concurrentes, el servidor podr\u00eda dejar de responder"
}
],
"id": "CVE-2020-11996",
"lastModified": "2024-11-21T04:59:04.687",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2020-06-26T17:15:10.153",
"references": [
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"tags": [
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],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
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]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:45:48+00:00",
"cve": "CVE-2020-11996",
"id": "CVE-2020-11996",
"initial_release_date": "2020-06-25T00:00:00+00:00",
"product_status:fixed": "63",
"product_status:known_affected": "10",
"product_status:known_not_affected": "25",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "tomcat: specially crafted sequence of HTTP/2 requests can lead to DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-11996.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-05T17:14:26Z",
"cve": "CVE-2020-11996",
"id": "CVE-2020-11996",
"initial_release_date": "2023-02-15T03:59:24Z",
"product_status:known_affected": "439",
"product_status:known_not_affected": "94",
"product_status:recommended": "526",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-11996",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-11996.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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