CVE-2021-36133

7.1 High

The OPTEE-OS CSU driver for NXP i.MX SoC devices lacks security access configuration for several models, resulting in TrustZone bypass because the NonSecure World can perform arbitrary memory read/write operations on Secure World memory. This involves a DMA capable peripheral.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.27%Down 0.1 points since Dec 8, 2021

What each source reports

NVD Score used 7.1

Record: CVE-2021-36133
CVSS 3.1: 7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0: 3.6 LowAV:L/AC:L/Au:N/C:P/I:P/A:N
Weakness: CWE-732
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-36133
Updated: 2026-11-02

EUVDEUVD-2021-22765 No score

Record: EUVD-2021-22765
Updated: 2026-11-03

OSV 7.1

Record: CVE-2021-36133
CVSS 3.1: 7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-36133 7.1

Record: DEBIAN-CVE-2021-36133
CVSS 3.1: 7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-36133 7.1

Record: UBUNTU-CVE-2021-36133
CVSS 3.1: 7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

Affected products

trustedfirmware op-tee

Affected packages

Affected packages
Package	Affected	Fixed
`optee-os` Debian:13	All versions, plus listed versions 4.10.0-14.10.0-24.5.0-24.7.0-14.8.0-14.9.0-1	None known
`optee-os` Ubuntu:25.10	All versions, plus listed versions 4.5.0-14.5.0-24.7.0-1	None known
`optee-os` Ubuntu:26.10	All versions, plus listed versions 4.8.0-14.10.0-14.10.0-2	None known
`optee-os` Ubuntu:26.04:LTS	All versions, plus listed versions 4.7.0-14.8.0-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-36133 is a high vulnerability (CVSS 7.1) in Trustedfirmware Op-tee, published December 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. No source names a fixed version.