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CVE-2026-40003

MediumPublished

USB-based arbitrary memory write vulnerability in ZTE ZX297520V3 soc BootROM

Published: May 7, 2026
Updated: May 19, 2026
Assigning CNA: zte
Evidence observed: Aug 26, 2026

Primary CVSS

6.8/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 22.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-40003Exploit
Exploit for CVE-2026-40003, an arbitrary memory write vulnerability in ZXIC/Sanechips ZX297520V3 SoC BootROM, enabling code execution via USB download mode.

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