FKIE_CVE-2018-11763
Vulnerability from fkie_nvd - Published: 2018-09-25 21:29 - Updated: 2026-06-17 01:36
Severity
Summary
In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| apache | http_server | * | |
| canonical | ubuntu_linux | 18.04 | |
| redhat | enterprise_linux | 6.0 | |
| redhat | enterprise_linux | 7.0 | |
| redhat | enterprise_linux | 7.4 | |
| redhat | enterprise_linux | 7.5 | |
| redhat | enterprise_linux | 7.6 | |
| oracle | enterprise_manager_ops_center | 12.3.3 | |
| oracle | hospitality_guest_access | 4.2.0 | |
| oracle | hospitality_guest_access | 4.2.1 | |
| oracle | instantis_enterprisetrack | 17.1 | |
| oracle | instantis_enterprisetrack | 17.2 | |
| oracle | instantis_enterprisetrack | 17.3 | |
| oracle | retail_xstore_point_of_service | 7.0 | |
| oracle | retail_xstore_point_of_service | 7.1 | |
| oracle | secure_global_desktop | 5.4 | |
| netapp | storage_automation_store | - |
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"value": "In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol."
},
{
"lang": "es",
"value": "En Apache HTTP Server, de la versi\u00f3n 2.4.17 a la 2.4.34, mediante el env\u00edo continuo de tramas SETTINGS grandes, un cliente puede ocupar una conexi\u00f3n, hilo del servidor y tiempo de CPU sin que se active ning\u00fan agotamiento del tiempo de conexi\u00f3n. Esto solo afecta a las conexiones HTTP/2. Una posible mitigaci\u00f3n es no activar el protocolo h2."
}
],
"id": "CVE-2018-11763",
"lastModified": "2026-06-17T01:36:32.157",
"metrics": {
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{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
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"source": "nvd@nist.gov",
"type": "Primary",
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
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"impactScore": 3.6,
"source": "nvd@nist.gov",
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},
"published": "2018-09-25T21:29:00.283",
"references": [
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"url": "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html"
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{
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]
}
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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
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