{"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 múltiples paquetes en respuesta a un paquete de reinicio enviado desde el cliente al que éste no responde de nuevo, resultando en un ataque de amplificación 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"}]}