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CVE-2026-40003— USB-based arbitrary memory write vulnerability in ZTE ZX297520V3 soc BootROM

Quick assessment

Affected
ZTE ZX297520V3 BootROM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZTE ZX297520V3是中国中兴通讯（ZTE）公司的一款工业级4G模组。 ZTE ZX297520V3存在缓冲区错误漏洞，该漏洞源于USB下载模式缺乏目标地址验证，可能导致任意内存写入，进而覆盖堆栈、劫持执行流程、绕过安全启动签名验证机制并实现未授权代码执行。

CVSS 5.1 · Medium EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
ZTE ZX297520V3 BootROM 7520V3 chip affected
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I. Basic Information for CVE-2026-40003

Vulnerability Information
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Vulnerability Title
USB-based arbitrary memory write vulnerability in ZTE ZX297520V3 soc BootROM
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
ZTE ZX297520V3 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZTE ZX297520V3是中国中兴通讯（ZTE）公司的一款工业级4G模组。 ZTE ZX297520V3存在缓冲区错误漏洞，该漏洞源于USB下载模式缺乏目标地址验证，可能导致任意内存写入，进而覆盖堆栈、劫持执行流程、绕过安全启动签名验证机制并实现未授权代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZTE ZX297520V3 BootROM 7520V3 chip -

II. Public POCs for CVE-2026-40003

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III. Intelligence Information for CVE-2026-40003

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Vendor Advisories for CVE-2026-40003 (1)

Same Patch Batch · ZTE · 2026-05-07 · 4 CVEs total

CVE-2026-44406 5.7 MEDIUM DLL Hijacking Vulnerability in ZTE Cloud PC Client uSmartview
CVE-2026-40004 5.5 MEDIUM openssl.cnf Privilege Escalation Vulnerability in ZTE Cloud PC Client uSmartview
CVE-2026-44407 4.7 MEDIUM Remote Denial of Service Vulnerability Exists in ZTE Cloud PC Client uSmartview

IV. Related Vulnerabilities

Same vendor: ZTE
Same weakness: CWE-787

V. Comments for CVE-2026-40003

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