{ "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/centos8.5els/vex/2020/cve-2020-28200-els_os-centos8_5els.json" } ], "tracking": { "current_release_date": "2026-04-20T16:45:49Z", "generator": { "date": "2026-04-20T16:45:49Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2020-28200-ELS_OS-CENTOS8.5ELS", "initial_release_date": "2020-01-01T00:00:00Z", "revision_history": [ { "date": "2020-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-10T19:36:01Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-04-20T16:45:49Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2020-28200" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 8.5", "product": { "name": "Community Enterprise Operating System 8.5", "product_id": "CentOS-8.5", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:8.5:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" }, { "branches": [ { "category": "product_version", "name": "dovecot-pigeonhole-1:2.3.8-9.el8.x86_64", "product": { "name": "dovecot-pigeonhole-1:2.3.8-9.el8.x86_64", "product_id": "dovecot-pigeonhole-1:2.3.8-9.el8.x86_64", "product_identification_helper": { "purl": "pkg:rpm/centos/dovecot-pigeonhole@2.3.8-9.el8?arch=x86_64&epoch=1" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "product": { "name": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "product_id": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-pigeonhole@2.3.8-9.el8.tuxcare.els1?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "product": { "name": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "product_id": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-pigeonhole@2.3.8-9.el8.tuxcare.els2?arch=x86_64&epoch=1" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64 as a component of Community Enterprise Operating System 8.5", "product_id": "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64" }, "product_reference": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "relates_to_product_reference": "CentOS-8.5" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 8.5", "product_id": "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64" }, "product_reference": "dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-8.5" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-pigeonhole-1:2.3.8-9.el8.x86_64 as a component of Community Enterprise Operating System 8.5", "product_id": "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.x86_64" }, "product_reference": "dovecot-pigeonhole-1:2.3.8-9.el8.x86_64", "relates_to_product_reference": "CentOS-8.5" } ] }, "vulnerabilities": [ { "cve": "CVE-2020-28200", "cwe": { "id": "CWE-770", "name": "Allocation of Resources Without Limits or Throttling" }, "notes": [ { "category": "description", "text": "The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.", "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-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2020-28200" }, { "category": "external", "summary": "https://dovecot.org/security", "url": "https://dovecot.org/security" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JB2VTJ3G2ILYWH5Y2FTY2PUHT2MD6VMI/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JB2VTJ3G2ILYWH5Y2FTY2PUHT2MD6VMI/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TK424DWFO2TKJYXZ2H3XL633TYJL4GQN/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TK424DWFO2TKJYXZ2H3XL633TYJL4GQN/" }, { "category": "external", "summary": "https://www.openwall.com/lists/oss-security/2021/06/28/3", "url": "https://www.openwall.com/lists/oss-security/2021/06/28/3" } ], "release_date": "2021-06-28T13:15:00Z", "remediations": [ { "category": "no_fix_planned", "details": "This issue is a DoS-only flaw in Dovecot’s Sieve engine (LMTP/LDA path) with no confidentiality or integrity impact, so it affects availability only. It is only triggerable when Sieve filtering is deployed and actively uses the regex extension with complex/pathological expressions in user or global scripts; without such scripts, crafted mail cannot induce the condition. Even when present, the effect is confined to delivery worker processes rather than long‑lived services and does not grant code execution or access, making it a low‑priority risk in centrally managed enterprise deployments.", "product_ids": [ "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.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": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1" }, "products": [ "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els1.x86_64", "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.tuxcare.els2.x86_64", "CentOS-8.5:dovecot-pigeonhole-1:2.3.8-9.el8.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }