Arbitrary Memory Write Vulnerability in ZTE ZX297520V3 BootROM
CVE-2026-40003

5.1MEDIUM

Key Information:

Vendor

Zte

Status
Zx297520v3 Bootrom
Vendor
CVE Published:
7 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-40003?

The ZTE ZX297520V3 BootROM is susceptible to an arbitrary memory write vulnerability that can be exploited via USB. This weakness stems from the lack of proper validation for target addresses during USB download mode, allowing attackers to manipulate memory locations within the BootROM runtime. By writing data to any designated memory location, attackers can overwrite the stack, potentially hijacking execution flow and circumventing Secure Boot's signature verification. This puts the affected systems at significant risk of unauthorized code execution and further compromises system integrity.

Affected Version(s)

ZX297520V3 BootROM 7520V3 chip

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-40003
Created by rva3

References

https://support.zte.com.cn/zte-iccp-isupport-webui/bullet...

CVSS V3.1

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Physical
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

rva3
.