{ "document": { "aggregate_severity": { "text": "Low" }, "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/ubuntu18.04els/vex/2020/cve-2020-11810-els_os-ubuntu18_04els.json" } ], "tracking": { "current_release_date": "2026-04-24T10:45:31Z", "generator": { "date": "2026-04-24T10:45:31Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2020-11810-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2020-04-27T15:15:00Z", "revision_history": [ { "date": "2020-04-27T15:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-24T10:45:31Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on CVE-2020-11810" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 18.04", "product": { "name": "Ubuntu 18.04", "product_id": "Ubuntu-18", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" }, { "branches": [ { "category": "product_version", "name": "openvpn-0:2.4.4-2ubuntu1.7.amd64", "product": { "name": "openvpn-0:2.4.4-2ubuntu1.7.amd64", "product_id": "openvpn-0:2.4.4-2ubuntu1.7.amd64", "product_identification_helper": { "purl": "pkg:deb/ubuntu/openvpn@2.4.4-2ubuntu1.7?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "product": { "name": "openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "product_id": "openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/openvpn@2.4.4-2ubuntu1.7%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64" }, "product_reference": "openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "openvpn-0:2.4.4-2ubuntu1.7.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7.amd64" }, "product_reference": "openvpn-0:2.4.4-2ubuntu1.7.amd64", "relates_to_product_reference": "Ubuntu-18" } ] }, "vulnerabilities": [ { "cve": "CVE-2020-11810", "cwe": { "id": "CWE-362", "name": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')" }, "notes": [ { "category": "description", "text": "An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.", "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": [ "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2020-11810" }, { "category": "external", "summary": "https://bugzilla.suse.com/show_bug.cgi?id=1169925", "url": "https://bugzilla.suse.com/show_bug.cgi?id=1169925" }, { "category": "external", "summary": "https://community.openvpn.net/openvpn/ticket/1272", "url": "https://community.openvpn.net/openvpn/ticket/1272" }, { "category": "external", "summary": "https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab", "url": "https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html", "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/" }, { "category": "external", "summary": "https://patchwork.openvpn.net/patch/1079/", "url": "https://patchwork.openvpn.net/patch/1079/" }, { "category": "external", "summary": "https://security-tracker.debian.org/tracker/CVE-2020-11810", "url": "https://security-tracker.debian.org/tracker/CVE-2020-11810" } ], "release_date": "2020-04-27T15:15:00Z", "remediations": [ { "category": "no_fix_planned", "details": "CVE-2020-11810 is a narrowly scoped, timing‑dependent denial‑of‑service that only applies to OpenVPN 2.4.x prior to 2.4.9 when Negotiable Cipher Parameters (NCP) is enabled, and it neither compromises confidentiality nor integrity. Exploitation requires an unauthenticated attacker to inject a crafted P_DATA_V2 packet with the victim’s peer‑id within a brief window of initial connection setup (typically seconds), so practical reliability is low and the effect is limited to a transient connection drop. Given these constraints and the requirement for NCP, this issue can be safely deprioritized in centrally managed server/VM deployments.", "product_ids": [ "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7.amd64" ] } ], "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": "LOW", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1" }, "products": [ "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7+tuxcare.els1.amd64", "Ubuntu-18:openvpn-0:2.4.4-2ubuntu1.7.amd64" ] } ], "threats": [ { "category": "impact", "details": "Low" } ] } ] }