CVE-2026-40003
MediumCVSS 5.1Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
The BootROM in ZTE ZX297520V3 contains a vulnerability allowing arbitrary memory writes via USB. Attackers can exploit the lack of target address validation in USB download mode to overwrite the stack, hijack execution flow, and bypass Secure Boot signature verification.
Risk Assessment
This enables unauthorized code execution and full device compromise, potentially leading to system takeover.
Recommendation
Apply the vendor firmware update if available. Restrict physical access to the device's USB ports.
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Original NVD description (English source)
ZTE ZX297520V3 BootROM contains a vulnerability that allows arbitrary memory writes via USB. Attackers can exploit the lack of target address validation in the USB download mode to write data to any location in BootROM runtime memory, thereby overwriting the stack, hijacking the execution flow, bypassing the Secure Boot signature verification mechanism, and achieving unauthorized code execution.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

