CVE-2026-40003

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.

CVSS v3.1

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

CVSS v3.1

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

EPSS

0.30% chance of exploitation in the next 30 days, 22th percentile

Published

2026-05-07

Updated

2026-05-19

Proof-of-concept exploits (1)

• rva3/CVE-2026-4000314★ · 2026-05-07

References

• CVE Record
• NVD entry

Related

• CVE-2026-40000
• CVE-2026-40022
• CVE-2026-39987
• CVE-2026-40034
• CVE-2026-39983
• CVE-2026-40036