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CVE-2026-40003

5.1 · MEDIUM

ZTE ZX297520V3 BootROM contains a vulnerability that allows arbitrary memory writes via USB.

Published May 7, 2026CWE-787EPSS 0.25%

Overview

CVE-2026-40003 is a medium-severity vulnerability. It was published on May 7, 2026 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsupport.zte.com.cn/zte-iccp-isupport-webui/bulletin/detail/2144487415169560645

How CyberStrike helps

Frequently asked questions

What is CVE-2026-40003?

CVE-2026-40003 is a medium-severity vulnerability. It was published on May 7, 2026 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2026-40003?

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-40003?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-40003?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40003 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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