{"id":"CVE-2021-28484","aliases":["GHSA-8m9g-647g-5pxw"],"url":"https://o3.security/vulnerability/CVE-2021-28484","summary":"Infinite loop in Yubico yubihsm-connector","details":"An issue was discovered in the /api/connector endpoint handler in Yubico yubihsm-connector before 3.0.1 (in YubiHSM SDK before 2021.04). The handler did not validate the length of the request, which can lead to a state where yubihsm-connector becomes stuck in a loop waiting for the YubiHSM to send it data, preventing any further operations until the yubihsm-connector is restarted. An attacker can send 0, 1, or 2 bytes to trigger this.","published":"2021-04-14T18:15:14.440Z","modified":"2026-07-08T06:00:07.312816616Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/Yubico/yubihsm-connector","fixedVersion":"3.0.1"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/"},{"type":"ADVISORY","url":"https://github.com/Yubico/yubihsm-connector/releases"},{"type":"ADVISORY","url":"https://www.yubico.com/support/security-advisories/ysa-2021-02/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:00:07.312816616Z"}}