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

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Summary

CVECVE-2026-40003
StatePUBLISHED
Assignerzte
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 02:16:03 UTC
Updated2026-05-13 19:19:26 UTC
DescriptionZTE 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

EPSS: 0.000250000 probability, percentile 0.071800000 (date 2026-05-21)

Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.8MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary5.1MEDIUMCVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
3.1CNACVSS5.1MEDIUMCVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Zte Zx297520v3 - All All All
Operating System Zte Zx297520v3 Firmware - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ZTE ZX297520V3 BootROM affected 7520V3 chip Not specified

References

ReferenceSourceLinkTags
support.zte.com.cn/zte-iccp-isupport-webui/bulletin/detail/2144487415169560645 [email protected] support.zte.com.cn Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: rva3 (en)

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