{ "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-2021-28652-els_os-centos7els.json" } ], "tracking": { "current_release_date": "2026-04-17T20:40:40Z", "generator": { "date": "2026-04-17T20:40:40Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-28652-ELS_OS-CENTOS7ELS", "initial_release_date": "2021-05-27T12:15:00Z", "revision_history": [ { "date": "2021-05-27T12:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-17T20:40:40Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on CVE-2021-28652" }, "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" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product": { "name": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product_id": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/squid@3.5.20-17.0.5.el7_9.99.tuxcare.els3?arch=x86_64&epoch=7" } } }, { "category": "product_version", "name": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "product": { "name": 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"pkg:rpm/tuxcare/squid-sysvinit@3.5.20-17.0.5.el7_9.99.tuxcare.els2?arch=x86_64&epoch=7" } } }, { "category": "product_version", "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product": { "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product_id": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/squid-sysvinit@3.5.20-17.0.5.el7_9.99.tuxcare.els3?arch=x86_64&epoch=7" } } }, { "category": "product_version", "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "product": { "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "product_id": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/squid-sysvinit@3.5.20-17.0.5.el7_9.99.tuxcare.els4?arch=x86_64&epoch=7" } } }, { "category": "product_version", "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "product": { "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "product_id": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/squid-migration-script@3.5.20-17.0.5.el7_9.99.tuxcare.els2?arch=x86_64&epoch=7" } } }, { "category": "product_version", "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "product": { "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "product_id": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/squid-migration-script@3.5.20-17.0.5.el7_9.99.tuxcare.els4?arch=x86_64&epoch=7" } } }, { "category": "product_version", "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product": { "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product_id": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/squid-migration-script@3.5.20-17.0.5.el7_9.99.tuxcare.els3?arch=x86_64&epoch=7" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64" }, "product_reference": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64" }, "product_reference": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64" }, "product_reference": "squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64" }, "product_reference": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64" }, "product_reference": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64" }, "product_reference": "squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64" }, "product_reference": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64" }, "product_reference": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64" }, "product_reference": "squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "relates_to_product_reference": "CentOS-7" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-28652", "cwe": { "id": "CWE-401", "name": "Missing Release of Memory after Effective Lifetime" }, "notes": [ { "category": "description", "text": "An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.", "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": { "under_investigation": [ "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-28652" }, { "category": "external", "summary": "http://seclists.org/fulldisclosure/2023/Oct/14", "url": "http://seclists.org/fulldisclosure/2023/Oct/14" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2023/10/11/3", "url": "http://www.openwall.com/lists/oss-security/2023/10/11/3" }, { "category": "external", "summary": "https://bugs.squid-cache.org/show_bug.cgi?id=5106", "url": "https://bugs.squid-cache.org/show_bug.cgi?id=5106" }, { "category": "external", "summary": "https://github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447", "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html", "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/" }, { "category": "external", "summary": "https://www.debian.org/security/2021/dsa-4924", "url": "https://www.debian.org/security/2021/dsa-4924" } ], "release_date": "2021-05-27T12:15:00Z", "remediations": [ { "category": "none_available", "details": "Affected", "product_ids": [ "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64" ] } ], "scores": [ { "cvss_v2": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 4.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P", "version": "2.0" }, "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-migration-script-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els2.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els3.x86_64", "CentOS-7:squid-sysvinit-7:3.5.20-17.0.5.el7_9.99.tuxcare.els4.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }