CVE-2018-11763 (GCVE-0-2018-11763)
Vulnerability from cvelistv5 – Published: 2018-09-25 21:00 – Updated: 2024-09-17 02:21
VLAI
EPSS
VEX
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.
Severity
5.9 (Medium)
CWE
- mod_http2, DoS via continuous SETTINGS frames
Assigner
References
26 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.17 to 2.4.34
|
guessed |
Date Public
2018-09-25 00:00
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"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2018-11763",
"datePublished": "2018-09-25T21:00:00.000Z",
"dateReserved": "2018-06-05T00:00:00.000Z",
"dateUpdated": "2024-09-17T02:21:55.083Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2018-11763",
"date": "2026-09-16",
"epss": "0.50847",
"percentile": "0.98866"
},
"fkie_nvd": {
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"descriptions": "[{\"lang\": \"en\", \"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": "2024-11-21T03:43:58.790",
"metrics": "{\"cvssMetricV30\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 5.9, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:N/I:N/A:P\", \"baseScore\": 4.3, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
"published": "2018-09-25T21:29:00.283",
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"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-noinfo\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2018-11763\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2018-09-25T21:29:00.283\",\"lastModified\":\"2024-11-21T03:43:58.790\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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. 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:51:24+00:00",
"cve": "CVE-2018-11763",
"id": "CVE-2018-11763",
"initial_release_date": "2018-09-25T00:00:00+00:00",
"product_status:fixed": "475",
"product_status:known_affected": "1",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "httpd: DoS for HTTP/2 connections by continuous SETTINGS frames",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-11763.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2025-10-07T09:54:28Z",
"cve": "CVE-2018-11763",
"id": "CVE-2018-11763",
"initial_release_date": "2023-02-15T04:27:09Z",
"product_status:known_affected": "25",
"product_status:known_not_affected": "47",
"product_status:recommended": "226",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2018-11763",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2018-11763.json",
"version": "12"
}
}
}
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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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