{"id":"CVE-2021-40327","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-40327","generatedAt":"2026-10-27T18:48:43.810Z","title":"Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control.","description":"Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key (held by the Crypto service) based solely on knowledge of its key ID. For example, there is no authorization check associated with the relationship between a caller and a key owner.","published":"2022-01-13T16:15:08.000Z","lastModified":"2026-06-17T04:06:44.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-862"],"affected":["trustedfirmware/trusted firmware-m"],"epss":{"score":0.01194,"percentile":0.6783,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://developer.arm.com/support/arm-security-updates","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.html","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://developer.arm.com/support/arm-security-updates","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.html","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-40327","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}