{"api_version":"1","generated_at":"2026-04-21T10:24:18+00:00","cve":"CVE-2021-27217","urls":{"html":"https://cve.report/CVE-2021-27217","api":"https://cve.report/api/cve/CVE-2021-27217.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-27217","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27217"},"summary":{"title":"CVE-2021-27217","description":"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.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-03-04 18:15:00","updated_at":"2021-03-26 20:07:00"},"problem_types":["CWE-125"],"metrics":[],"references":[{"url":"https://www.yubico.com/support/security-advisories/ysa-2021-01/","name":"https://www.yubico.com/support/security-advisories/ysa-2021-01/","refsource":"CONFIRM","tags":["Vendor Advisory"],"title":"Security Advisory YSA-2021-01 - Yubico","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://blog.inhq.net/posts/yubico-libyubihsm-vuln2","name":"https://blog.inhq.net/posts/yubico-libyubihsm-vuln2","refsource":"MISC","tags":[],"title":"Yubico libyubihsm Vulnerabilities | invd blog","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/Yubico/yubihsm-shell/releases","name":"https://github.com/Yubico/yubihsm-shell/releases","refsource":"MISC","tags":["Release Notes","Third Party Advisory"],"title":"Releases · Yubico/yubihsm-shell · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-27217","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27217","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"27217","vulnerable":"1","versionEndIncluding":"2.0.3","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"yubico","cpe5":"yubihsm-shell","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-27217","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://github.com/Yubico/yubihsm-shell/releases","refsource":"MISC","name":"https://github.com/Yubico/yubihsm-shell/releases"},{"refsource":"CONFIRM","name":"https://www.yubico.com/support/security-advisories/ysa-2021-01/","url":"https://www.yubico.com/support/security-advisories/ysa-2021-01/"},{"refsource":"MISC","name":"https://blog.inhq.net/posts/yubico-libyubihsm-vuln2","url":"https://blog.inhq.net/posts/yubico-libyubihsm-vuln2"}]}},"nvd":{"publishedDate":"2021-03-04 18:15:00","lastModifiedDate":"2021-03-26 20:07:00","problem_types":["CWE-125"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":4.4,"baseSeverity":"MEDIUM"},"exploitabilityScore":0.7,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:S/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":3.5},"severity":"LOW","exploitabilityScore":6.8,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:yubico:yubihsm-shell:*:*:*:*:*:*:*:*","versionEndIncluding":"2.0.3","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"27217","Ordinal":"202308","Title":"CVE-2021-27217","CVE":"CVE-2021-27217","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"27217","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"27217","Ordinal":"2","NoteData":"2021-03-04","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"27217","Ordinal":"3","NoteData":"2021-03-16","Type":"Other","Title":"Modified"}]}}}