{ "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/centos7els/vex/2021/cve-2021-20208-els_os-centos7els.json" } ], "tracking": { "current_release_date": "2026-06-12T15:35:39Z", "generator": { "date": "2026-06-12T15:35:39Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-20208-ELS_OS-CENTOS7ELS", "initial_release_date": "2021-04-19T22:15:00Z", "revision_history": [ { "date": "2021-04-19T22:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-06-12T15:35:39Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on CVE-2021-20208" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 7", "product": { "name": "Community Enterprise Operating System 7", "product_id": "CentOS-7", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:7:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" }, { "branches": [ { "category": "product_version", "name": "cifs-utils-0:6.2-10.el7.0.5.x86_64", "product": { "name": "cifs-utils-0:6.2-10.el7.0.5.x86_64", "product_id": "cifs-utils-0:6.2-10.el7.0.5.x86_64", "product_identification_helper": { "purl": "pkg:rpm/centos/cifs-utils@6.2-10.el7.0.5?arch=x86_64" } } }, { "category": "product_version", "name": "cifs-utils-devel-0:6.2-10.el7.0.5.x86_64", "product": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.x86_64", "product_id": "cifs-utils-devel-0:6.2-10.el7.0.5.x86_64", "product_identification_helper": { "purl": "pkg:rpm/centos/cifs-utils-devel@6.2-10.el7.0.5?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "cifs-utils-devel-0:6.2-10.el7.0.5.i686", "product": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.i686", "product_id": "cifs-utils-devel-0:6.2-10.el7.0.5.i686", "product_identification_helper": { "purl": "pkg:rpm/centos/cifs-utils-devel@6.2-10.el7.0.5?arch=i686" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "product": { "name": "cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "product_id": "cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cifs-utils@6.2-10.el7.0.5.tuxcare.els2?arch=x86_64" } } }, { "category": "product_version", "name": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "product": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "product_id": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cifs-utils-devel@6.2-10.el7.0.5.tuxcare.els2?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "product": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "product_id": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cifs-utils-devel@6.2-10.el7.0.5.tuxcare.els2?arch=i686" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64" }, "product_reference": "cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-0:6.2-10.el7.0.5.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.x86_64" }, "product_reference": "cifs-utils-0:6.2-10.el7.0.5.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686" }, "product_reference": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.i686 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.i686" }, "product_reference": "cifs-utils-devel-0:6.2-10.el7.0.5.i686", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64" }, "product_reference": "cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-devel-0:6.2-10.el7.0.5.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.x86_64" }, "product_reference": "cifs-utils-devel-0:6.2-10.el7.0.5.x86_64", "relates_to_product_reference": "CentOS-7" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-20208", "cwe": { "id": "CWE-266", "name": "Incorrect Privilege Assignment" }, "notes": [ { "category": "description", "text": "A flaw was found in cifs-utils in versions before 6.13. A user when mounting a krb5 CIFS file system from within a container can use Kerberos credentials of the host. The highest threat from this vulnerability is to data confidentiality and integrity.", "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": [ "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.x86_64", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.i686", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-20208" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=1921116", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1921116" }, { "category": "external", "summary": "https://bugzilla.samba.org/show_bug.cgi?id=14651", "url": "https://bugzilla.samba.org/show_bug.cgi?id=14651" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2W4HSDIWXXNQBUW5ZS37RQMLJ7THK5AS/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2W4HSDIWXXNQBUW5ZS37RQMLJ7THK5AS/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/66WJ3SVBHCSNQZAWSGLB6FBOCFU45FFG/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/66WJ3SVBHCSNQZAWSGLB6FBOCFU45FFG/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4BZSJXROEFHYATAAHHRR6P3HUSMPQB3/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4BZSJXROEFHYATAAHHRR6P3HUSMPQB3/" } ], "release_date": "2021-04-19T22:15:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-06-12T13:07:10.751832Z", "details": "This vulnerability only applies when a container performs a Kerberos-authenticated (sec=krb5) CIFS/SMB mount; it does not affect systems that don’t mount from containers or that use non‑Kerberos authentication. Triggering it requires user action and the ability to execute kernel mounts from inside the container (e.g., CAP_SYS_ADMIN/privileged) while host Kerberos credentials are present—conditions that are not enabled by default and significantly raise exploitation difficulty. With a local attack vector, high complexity, no availability impact, and dependence on a specific container/Kerberos setup, this is a low‑priority issue for centrally managed VM/server environments.", "product_ids": [ "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.x86_64", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.i686", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.x86_64" ] } ], "scores": [ { "cvss_v2": { "accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N", "version": "2.0" }, "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N", "version": "3.1" }, "products": [ "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "CentOS-7:cifs-utils-0:6.2-10.el7.0.5.x86_64", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.i686", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.i686", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.tuxcare.els2.x86_64", "CentOS-7:cifs-utils-devel-0:6.2-10.el7.0.5.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }