{"id":"CVE-2021-44149","aliases":["EUVD-2021-31000"],"status":"published","description":"An issue was discovered in Trusted Firmware OP-TEE Trusted OS through 3.15.0. The OPTEE-OS CSU driver for NXP i.MX6UL SoC devices lacks security access configuration for wakeup-related registers, resulting in TrustZone bypass because the NonSecure World can perform arbitrary memory read/write operations on Secure World memory. This involves a v cycle.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0035,"percentile":0.29015,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-12-07T20:59:43Z","modified":"2026-06-17T04:11:57Z","products":[{"vendor":"trustedfirmware","product":"op-tee"}],"references":[{"url":"https://github.com/OP-TEE/optee_os/tags","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory"]},{"url":"https://github.com/f-secure-foundry/advisories/blob/master/Security_Advisory-Ref_FSC-HWSEC-VR2021-0002-OP-TEE_TrustZone_bypass_at_wakeup.txt","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-44149","description":"An issue was discovered in Trusted Firmware OP-TEE Trusted OS through 3.15.0. The OPTEE-OS CSU driver for NXP i.MX6UL SoC devices lacks security access configuration for wakeup-related registers, resulting in TrustZone bypass because the NonSecure World can perform arbitrary memory read/write operations on Secure World memory. This involves a v cycle.","status":"published","published":"2021-12-07T20:59:43Z","modified":"2024-08-04T04:17:24.901Z","updated_at":"2026-11-02T14:33:01.166399Z"}],"euvd":[{"id":"EUVD-2021-31000","description":"An issue was discovered in Trusted Firmware OP-TEE Trusted OS through 3.15.0. The OPTEE-OS CSU driver for NXP i.MX6UL SoC devices lacks security access configuration for wakeup-related registers, resulting in TrustZone bypass because the NonSecure World can perform arbitrary memory read/write operations on Secure World memory. This involves a v cycle.","status":"published","published":"2021-12-07T20:59:43Z","modified":"2024-08-04T04:17:24Z","updated_at":"2026-11-03T03:24:12.005069Z"}],"nvd":[{"id":"CVE-2021-44149","description":"An issue was discovered in Trusted Firmware OP-TEE Trusted OS through 3.15.0. The OPTEE-OS CSU driver for NXP i.MX6UL SoC devices lacks security access configuration for wakeup-related registers, resulting in TrustZone bypass because the NonSecure World can perform arbitrary memory read/write operations on Secure World memory. This involves a v cycle.","status":"published","published":"2021-12-07T21:15:08.653Z","modified":"2026-06-17T04:11:57.443Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:01.811115Z"}]}}