{"id":"CVE-2021-34387","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-34387","generatedAt":"2026-10-27T21:20:24.738Z","title":"The ARM TrustZone Technology on which Trusty is based on contains a vulnerability in access permission settings where the portion of the DRAM reserved for TrustZone is identity-mapped by TLK with read, write, and execute permissions, which gives write…","description":"The ARM TrustZone Technology on which Trusty is based on contains a vulnerability in access permission settings where the portion of the DRAM reserved for TrustZone is identity-mapped by TLK with read, write, and execute permissions, which gives write access to kernel code and data that is otherwise mapped read only.","published":"2021-06-21T22:15:08.000Z","lastModified":"2026-06-17T03:55:46.000Z","status":"Modified","sourceIdentifier":"psirt@nvidia.com","cvss":{"version":"3.1","score":6.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-276"],"affected":["nvidia/jetson linux"],"epss":{"score":0.00205,"percentile":0.1034,"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 (0.21%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://nvidia.custhelp.com/app/answers/detail/a_id/5205","tags":["Vendor Advisory"],"source":"psirt@nvidia.com"},{"url":"https://nvidia.custhelp.com/app/answers/detail/a_id/5205","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-34387","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."}