{ "document": { "aggregate_severity": { "text": "Critical" }, "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/ubuntu20.04els/vex/2021/cve-2021-40438-els_os-ubuntu20_04els.json" } ], "tracking": { "current_release_date": "2026-04-03T14:10:52Z", "generator": { "date": "2026-04-03T14:10:52Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-40438-ELS_OS-UBUNTU20.04ELS", "initial_release_date": "2021-09-16T15:15:00Z", "revision_history": [ { "date": "2021-09-16T15:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-03T14:10:52Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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20.04", "product_id": "Ubuntu-20:apache2-suexec-pristine-0:2.4.41-4ubuntu3.23.amd64" }, "product_reference": "apache2-suexec-pristine-0:2.4.41-4ubuntu3.23.amd64", "relates_to_product_reference": "Ubuntu-20" }, { "category": "default_component_of", "full_product_name": { "name": "apache2-suexec-custom-0:2.4.41-4ubuntu3.23.amd64 as a component of Ubuntu 20.04", "product_id": "Ubuntu-20:apache2-suexec-custom-0:2.4.41-4ubuntu3.23.amd64" }, "product_reference": "apache2-suexec-custom-0:2.4.41-4ubuntu3.23.amd64", "relates_to_product_reference": "Ubuntu-20" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-40438", "cwe": { "id": "CWE-918", "name": "Server-Side Request Forgery (SSRF)" }, "notes": [ { "category": "description", "text": "A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.", "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": { "fixed": [ "Ubuntu-20:apache2-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-bin-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-data-0:2.4.41-4ubuntu3.23+tuxcare.els1.all", "Ubuntu-20:apache2-dev-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-doc-0:2.4.41-4ubuntu3.23+tuxcare.els1.all", "Ubuntu-20:apache2-ssl-dev-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-suexec-custom-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-suexec-pristine-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-utils-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:libapache2-mod-md-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:libapache2-mod-proxy-uwsgi-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64" ], "known_affected": [ "Ubuntu-20:apache2-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-bin-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-data-0:2.4.41-4ubuntu3.23.all", "Ubuntu-20:apache2-dev-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-doc-0:2.4.41-4ubuntu3.23.all", "Ubuntu-20:apache2-ssl-dev-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-suexec-custom-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-suexec-pristine-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-utils-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:libapache2-mod-md-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:libapache2-mod-proxy-uwsgi-0:2.4.41-4ubuntu3.23.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-40438" }, { "category": "external", "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf", "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf" }, { "category": "external", "summary": "https://httpd.apache.org/security/vulnerabilities_24.html", "url": "https://httpd.apache.org/security/vulnerabilities_24.html" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E", "url": "https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html", "url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/" }, { "category": "external", "summary": "https://security.gentoo.org/glsa/202208-20", "url": "https://security.gentoo.org/glsa/202208-20" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20211008-0004/", "url": "https://security.netapp.com/advisory/ntap-20211008-0004/" }, { "category": "external", "summary": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ", "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ" }, { "category": "external", "summary": "https://www.debian.org/security/2021/dsa-4982", "url": "https://www.debian.org/security/2021/dsa-4982" }, { "category": "external", "summary": "https://www.oracle.com/security-alerts/cpuapr2022.html", "url": "https://www.oracle.com/security-alerts/cpuapr2022.html" }, { "category": "external", "summary": "https://www.oracle.com/security-alerts/cpujan2022.html", "url": "https://www.oracle.com/security-alerts/cpujan2022.html" }, { "category": "external", "summary": "https://www.tenable.com/security/tns-2021-17", "url": "https://www.tenable.com/security/tns-2021-17" }, { "category": "external", "summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438" } ], "release_date": "2021-09-16T15:15:00Z", "remediations": [ { "category": "none_available", "details": "Affected", "product_ids": [ "Ubuntu-20:apache2-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-bin-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-data-0:2.4.41-4ubuntu3.23.all", "Ubuntu-20:apache2-dev-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-doc-0:2.4.41-4ubuntu3.23.all", "Ubuntu-20:apache2-ssl-dev-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-suexec-custom-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-suexec-pristine-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-utils-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:libapache2-mod-md-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:libapache2-mod-proxy-uwsgi-0:2.4.41-4ubuntu3.23.amd64" ] } ], "scores": [ { "cvss_v2": { "accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0" }, "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Ubuntu-20:apache2-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-bin-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-bin-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-data-0:2.4.41-4ubuntu3.23+tuxcare.els1.all", "Ubuntu-20:apache2-data-0:2.4.41-4ubuntu3.23.all", "Ubuntu-20:apache2-dev-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-dev-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-doc-0:2.4.41-4ubuntu3.23+tuxcare.els1.all", "Ubuntu-20:apache2-doc-0:2.4.41-4ubuntu3.23.all", "Ubuntu-20:apache2-ssl-dev-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-ssl-dev-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-suexec-custom-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-suexec-custom-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-suexec-pristine-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-suexec-pristine-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:apache2-utils-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:apache2-utils-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:libapache2-mod-md-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:libapache2-mod-md-0:2.4.41-4ubuntu3.23.amd64", "Ubuntu-20:libapache2-mod-proxy-uwsgi-0:2.4.41-4ubuntu3.23+tuxcare.els1.amd64", "Ubuntu-20:libapache2-mod-proxy-uwsgi-0:2.4.41-4ubuntu3.23.amd64" ] } ], "threats": [ { "category": "impact", "details": "Critical" } ] } ] }