CertiK tested devices equipped with TEE-based dedicated wallets, revealing a major vulnerability in the trusted execution environment (TEE) of mobile devices. TEE has always been considered the ultimate defense for device security, requiring users to access TEE wallets through a PIN code when setting up wallets in "secure mode" on the device. However, CertiK's test results show that attackers can easily extract the PIN code stored in the TEE, and then access the wallet and obtain the private key, successfully stealing assets. The manufacturer of the test device quickly contacted CertiK and fixed the problem with the TEE seed library in the latest version. CertiK emphasized that Web3 users must remain highly vigilant and guard against implementation flaws in security measures. When necessary, professional third-party security audits and technologies should be sought to protect their assets.