{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-4234 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-4234 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-4234 is a high-severity denial of service vulnerability in OpenVPN Access Server, published on 6 Jul 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-4234 and fix it if it is affected.\n\nWhat it is: CVE-2021-4234 is a high-severity denial of service vulnerability in OpenVPN Access Server, published on 6 Jul 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-4234 in the wild and no public exploit code.\n\nAffected product: OpenVPN Access Server. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-4234/ (Markdown: https://insights.sbomify.com/CVE-2021-4234/index.md)","id":"CVE-2021-4234","markdown":"https://insights.sbomify.com/CVE-2021-4234/index.md","name":"CVE-2021-4234","record":{"aliases":["GHSA-qvww-9jm9-f3pm"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenVPN Access Server","requires_auth":"none","summary":"OpenVPN Access Server is vulnerable to a limited amplification attack via reset packets, potentially causing denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"OpenVPN","cpe":[{"product":"openvpn_access_server","vendor":"openvpn"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-406","name":"Insufficient Control of Network Message Volume (Network Amplification)"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Denial of service in OpenVPN Access Server","id":"CVE-2021-4234","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Denial of service in gopkg.in/yaml.v2","id":"CVE-2021-4235"},"packages":[],"prev":{"headline":"Zoo Management System manage-ticket.php cross site scripting","id":"CVE-2021-4232"},"products":["OpenVPN Access Server"],"published":"2022-07-06","related":[{"cvss_score":9.8,"headline":"Auth bypass in n/a","id":"CVE-2020-8953","kev_date_added":null,"published":"2020-02-13"},{"cvss_score":7.5,"headline":"Information disclosure in OpenVPN Access Server","id":"CVE-2022-33737","kev_date_added":null,"published":"2022-07-06"},{"cvss_score":7.5,"headline":"Weak cryptography in OpenVPN Access Server","id":"CVE-2022-33738","kev_date_added":null,"published":"2022-07-06"},{"cvss_score":7.5,"headline":"Denial of service in OpenVPN Access Server","id":"CVE-2020-36382","kev_date_added":null,"published":"2021-06-04"},{"cvss_score":7.5,"headline":"Security feature bypass in OpenVPN Access Server","id":"CVE-2020-15074","kev_date_added":null,"published":"2020-07-14"},{"cvss_score":7.5,"headline":"XML external entity in n/a","id":"CVE-2020-11462","kev_date_added":null,"published":"2020-05-04"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"OpenVPN Access Server is vulnerable to a limited amplification attack via reset packets, potentially causing denial of service.","url":"https://insights.sbomify.com/CVE-2021-4234/"}