{"id":"CVE-2021-43399","aliases":["EUVD-2021-30334","GHSA-vrp3-rwcp-4q77"],"status":"published","title":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not...","description":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01413,"percentile":0.72908,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-12-08T18:31:33Z","modified":"2026-06-17T04:10:55Z","products":[{"vendor":"yubico","product":"yubihsm_2_software_development_kit"}],"references":[{"url":"https://www.yubico.com/support/security-advisories/ysa-2021-04/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43399"},{"url":"https://github.com/advisories/GHSA-vrp3-rwcp-4q77"}],"sources":{"cve":[{"id":"CVE-2021-43399","description":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.","status":"published","published":"2021-12-08T18:31:33Z","modified":"2024-08-04T03:55:28.623Z","updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-30334","description":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.","status":"published","published":"2021-12-08T18:31:33Z","modified":"2024-08-04T03:55:28Z","updated_at":"2026-11-03T03:24:14.245608Z"}],"ghsa":[{"id":"GHSA-vrp3-rwcp-4q77","title":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not...","description":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.","status":"published","published":"2021-12-09T00:00:34Z","modified":"2023-02-01T05:07:01Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:50:27.906349Z"}],"nvd":[{"id":"CVE-2021-43399","description":"The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.","status":"published","published":"2021-12-08T19:15:10.02Z","modified":"2026-06-17T04:10:55.12Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:02.189991Z"}]}}