Vulnerability · Published May 7, 2026 · Assigned by zte
CVE-2026-40003USB-based arbitrary memory write vulnerability in ZTE ZX297520V3 soc BootROM
Medium 5.1
In plain English
A medium-severity out-of-bounds write in ZX297520V3 BootROM from ZTE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ZTE | ZX297520V3 BootROM | 7520V3 chip |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L