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{"id": "CVE-2021-4234", "vendorId": null, "type": "cve", "bulletinFamily": "NVD", "title": "CVE-2021-4234", "description": "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.", "published": "2022-07-06T20:15:00", "modified": "2022-07-14T12:15:00", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}, "cvss2": {"cvssV2": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0}, "severity": "MEDIUM", "exploitabilityScore": 10.0, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "cvss3": {"cvssV3": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}, "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-4234", "reporter": "security@openvpn.net", "references": ["https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0"], "cvelist": ["CVE-2021-4234"], "immutableFields": [], "lastseen": "2022-07-14T16:17:41", "viewCount": 4, "enchantments": {"twitter": {"counter": 8, "tweets": [{"link": "https://twitter.com/WolfgangSesin/status/1544816007109382152", "text": "New post from https://t.co/uXvPWJy6tj (CVE-2021-4234) has been published on https://t.co/YCRQjRgx6O", "author": "WolfgangSesin", "author_photo": "https://pbs.twimg.com/profile_images/957011635369054208/Om3jbj7z_400x400.jpg"}, {"link": "https://twitter.com/LinInfoSec/status/1544819266846953477", "text": "Openvpn - CVE-2021-4234:", "author": "LinInfoSec", "author_photo": "https://pbs.twimg.com/profile_images/806629896705507328/nxrtXOrp_400x400.jpg"}, {"link": "https://twitter.com/www_sesin_at/status/1544816008237649921", "text": "New post from https://t.co/9KYxtdZjkl (CVE-2021-4234) has been published on https://t.co/74rZrsd3xU", "author": "www_sesin_at", "author_photo": "https://pbs.twimg.com/profile_images/958100963822329858/fb_N8h5n_400x400.jpg"}, {"link": "https://twitter.com/threatintelctr/status/1544814269212299264", "text": " NEW: CVE-2021-4234 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, r... (click for more) https://t.co/vhdBJp0THF", "author": "threatintelctr", "author_photo": "https://pbs.twimg.com/profile_images/904224973987840000/dMy1x9Ho_400x400.jpg"}]}, "score": {"value": 3.7, "vector": "NONE"}, "vulnersScore": 3.7}, "_state": {"twitter": 0, "score": 1659865730, "dependencies": 1660016946}, "_internal": {"score_hash": "eba3b1b16555770f03545ec83f0d9690"}, "cna_cvss": {"cna": null, "cvss": {}}, "cpe": [], "cpe23": [], "cwe": ["NVD-CWE-Other"], "affectedSoftware": [{"cpeName": "openvpn:openvpn_access_server", "version": "2.11.0", "operator": "lt", "name": "openvpn openvpn access server"}], "affectedConfiguration": [], "cpeConfiguration": {"CVE_data_version": "4.0", "nodes": [{"operator": "OR", "children": [], "cpe_match": [{"vulnerable": true, "cpe23Uri": "cpe:2.3:a:openvpn:openvpn_access_server:2.11.0:*:*:*:*:*:*:*", "versionEndExcluding": "2.11.0", "cpe_name": []}]}]}, "extraReferences": [{"url": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0", "name": "https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0", "refsource": "MISC", "tags": ["Release Notes", "Vendor Advisory"]}]}

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