{ "document": { "aggregate_severity": { "text": "Medium" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/oraclelinux6els/vex/2018/cve-2018-11763-els_os-oraclelinux6els.json" } ], "tracking": { "current_release_date": "2026-04-19T13:44:10Z", "generator": { "date": "2026-04-19T13:44:10Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2018-11763-ELS_OS-ORACLELINUX6ELS", "initial_release_date": "2018-09-25T21:29:00Z", "revision_history": [ { "date": "2018-09-25T21:29:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-15T22:50:57Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-04-19T13:44:10Z", "number": "3", 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"Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.i686" }, "product_reference": "httpd-devel-0:2.2.15-71.el6.i686", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "httpd-devel-0:2.2.15-71.el6.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.x86_64" }, "product_reference": "httpd-devel-0:2.2.15-71.el6.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "httpd-tools-0:2.2.15-72.el6.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.x86_64" }, "product_reference": "httpd-tools-0:2.2.15-72.el6.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "mod_ssl-1:2.2.15-72.el6.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.x86_64" }, "product_reference": "mod_ssl-1:2.2.15-72.el6.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "httpd-0:2.2.15-72.el6.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:httpd-0:2.2.15-72.el6.x86_64" }, "product_reference": "httpd-0:2.2.15-72.el6.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "httpd-manual-0:2.2.15-72.el6.noarch as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.noarch" }, "product_reference": "httpd-manual-0:2.2.15-72.el6.noarch", "relates_to_product_reference": "Oracle-Linux-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2018-11763", "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "known_affected": [ "Oracle-Linux-6:httpd-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.cloudlinux.els.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.cloudlinux.els.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.cloudlinux.els.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.cloudlinux.els.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els10.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els4.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els4.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els5.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els5.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els7.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els7.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els8.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els8.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els9.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els9.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.noarch", "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.tuxcare.els10.noarch", "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2018-11763" }, { "category": "external", "summary": "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html", "url": "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html" }, { "category": "external", "summary": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html", "url": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html" }, { "category": "external", "summary": "http://www.securityfocus.com/bid/105414", "url": 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"https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770%40%3Ccvs.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770%40%3Ccvs.httpd.apache.org%3E" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20190204-0004/", "url": "https://security.netapp.com/advisory/ntap-20190204-0004/" }, { "category": "external", "summary": "https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us", "url": "https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us" }, { "category": "external", "summary": "https://usn.ubuntu.com/3783-1/", "url": "https://usn.ubuntu.com/3783-1/" }, { "category": "external", "summary": "https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html", "url": "https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html" }, { "category": "external", "summary": "https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html", "url": "https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html" }, { "category": "external", "summary": "https://www.tenable.com/security/tns-2019-09", "url": "https://www.tenable.com/security/tns-2019-09" } ], "release_date": "2018-09-25T21:29:00Z", "remediations": [ { "category": "no_fix_planned", "details": "This is a DoS-only issue limited to HTTP/2 (mod_http2) in Apache httpd 2.4.17–2.4.34; systems without HTTP/2 explicitly enabled (the default) or with HTTP/2 terminated upstream are not exposed. Exploitation requires sustaining a continuous SETTINGS-frame flood over an active HTTP/2 session, yielding no confidentiality or integrity impact and only per-connection thread/CPU consumption. Given these constraints and the non-default nature of HTTP/2 on backend servers, this CVE can be safely deprioritized in centrally managed enterprise environments.", "product_ids": [ "Oracle-Linux-6:httpd-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.cloudlinux.els.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.cloudlinux.els.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.cloudlinux.els.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.cloudlinux.els.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els10.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els4.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els4.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els5.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els5.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els7.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els7.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els8.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els8.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els9.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els9.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.noarch", "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.tuxcare.els10.noarch", "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.x86_64" ] } ], "scores": [ { "cvss_v2": { "accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0" }, "cvss_v3": { "attackComplexity": "HIGH", "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" }, "products": [ "Oracle-Linux-6:httpd-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.cloudlinux.els.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.cloudlinux.els.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-71.el6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.cloudlinux.els.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.cloudlinux.els.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els10.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els4.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els4.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els5.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els5.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els6.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els6.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els7.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els7.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els8.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els8.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els9.i686", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.tuxcare.els9.x86_64", "Oracle-Linux-6:httpd-devel-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.noarch", "Oracle-Linux-6:httpd-manual-0:2.2.15-72.el6.tuxcare.els10.noarch", "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:httpd-tools-0:2.2.15-72.el6.x86_64", "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.tuxcare.els10.x86_64", "Oracle-Linux-6:mod_ssl-1:2.2.15-72.el6.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }