CVE-2021-4234

{"containers": {"cna": {"affected": [{"product": "OpenVPN Access Server", "vendor": "n/a", "versions": [{"status": "affected", "version": "2.10 and prior version"}]}], "descriptions": [{"lang": "en", "value": "OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-406", "description": "CWE-406: Insufficient Control of Network Message Volume", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-07-06T19:10:17.000Z", "orgId": "36a55730-e66d-4d39-8ca6-3c3b3017965e", "shortName": "OpenVPN"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@openvpn.net", "ID": "CVE-2021-4234", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "OpenVPN Access Server", "version": {"version_data": [{"version_value": "2.10 and prior version"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-406: Insufficient Control of Network Message Volume"}]}]}, "references": {"reference_data": [{"name": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0", "refsource": "MISC", "url": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:23:09.056Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0"}]}]}, "cveMetadata": {"assignerOrgId": "36a55730-e66d-4d39-8ca6-3c3b3017965e", "assignerShortName": "OpenVPN", "cveId": "CVE-2021-4234", "datePublished": "2022-07-06T19:10:17.000Z", "dateReserved": "2022-07-01T00:00:00.000Z", "dateUpdated": "2024-08-03T17:23:09.056Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "OpenVPN Access Server", "vendor": "n/a", "versions": [{"status": "affected", "version": "2.10 and prior version"}]}], "source": "security@openvpn.net"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "F315C5F8-CF55-4561-87FA-09A49636FDCB", "versionEndExcluding": "2.11.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack."}, {"lang": "es", "value": "OpenVPN Access Server versiones 2.10 y versiones anteriores, son susceptibles de reenviar m\u00faltiples paquetes en respuesta a un paquete de reinicio enviado desde el cliente al que \u00e9ste no responde de nuevo, resultando en un ataque de amplificaci\u00f3n limitada"}], "id": "CVE-2021-4234", "lastModified": "2026-06-17T04:19:19.240", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-07-06T20:15:08.127", "references": [{"source": "security@openvpn.net", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0"}], "sourceIdentifier": "security@openvpn.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-406"}], "source": "security@openvpn.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

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