{"id":"CVE-2021-27217","details":"An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.","modified":"2026-07-09T00:13:16.499553Z","published":"2021-03-04T18:15:14.050Z","references":[{"type":"ADVISORY","url":"https://github.com/Yubico/yubihsm-shell/releases"},{"type":"ADVISORY","url":"https://www.yubico.com/support/security-advisories/ysa-2021-01/"},{"type":"EVIDENCE","url":"https://blog.inhq.net/posts/yubico-libyubihsm-vuln2"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yubico/yubihsm-shell","events":[{"introduced":"0"},{"last_affected":"a2d66a90426dddac0d2060d2b4fce5c7545a6bc8"}],"database_specific":{"source":"CPE_RANGE","extracted_events":[{"introduced":"0"},{"last_affected":"2.0.3"}],"cpe":"cpe:2.3:a:yubico:yubihsm-shell:*:*:*:*:*:*:*:*"}}],"versions":["2.0.3","2.0.2","2.0.1","2.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27217.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H"}]}