{"id":"CVE-2021-34809","aliases":["EUVD-2021-21456","GHSA-46j9-2j4r-83q6"],"status":"published","title":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability...","description":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.","severity":{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01935,"percentile":0.80228,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-77"],"published":"2021-06-18T03:00:27Z","modified":"2026-06-17T03:56:36Z","products":[{"vendor":"qnap systems inc.","product":"download station"},{"vendor":"synology","product":"download station"},{"vendor":"synology","product":"download_station"}],"references":[{"url":"https://www.synology.com/security/advisory/Synology_SA_21_11","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34809"},{"url":"https://github.com/advisories/GHSA-46j9-2j4r-83q6"}],"sources":{"cve":[{"id":"CVE-2021-34809","description":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.","status":"published","published":"2021-06-18T03:00:27.054Z","modified":"2024-09-16T19:56:48.051Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T14:33:11.59359Z"}],"euvd":[{"id":"EUVD-2021-21456","description":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.","status":"published","published":"2021-06-18T03:00:27Z","modified":"2024-09-16T19:56:48Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:55:18.167658Z"}],"ghsa":[{"id":"GHSA-46j9-2j4r-83q6","title":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability...","description":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.","status":"published","published":"2022-05-24T19:05:40Z","modified":"2023-01-29T05:07:04Z","cwes":["CWE-77"],"updated_at":"2026-11-02T14:46:08.723565Z"}],"nvd":[{"id":"CVE-2021-34809","description":"Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.","status":"published","published":"2021-06-18T03:15:06.807Z","modified":"2026-06-17T03:56:36.577Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T14:06:54.892562Z"}]}}