Out-of-Bounds Write in ZTE ZX297520V3 BootROM (CVE-2026-40003)
Summary
Out-of-bounds write in ZTE ZX297520V3 BootROM (CVE-2026-40003). Data can be tampered with by attackers.
Original description
The description as published by the source.
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: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-40003 has been found in ZTE ZX297520V3 BootROM.
Data can be tampered with by attackers. CVSS score: 5.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "ZTE ZX297520V3 BootROM CVE-2026-40003" on the vendor's site.
CVE-2026-40003 (ZTE ZX297520V3 BootROM) — CWE-787 / CVSS v3 5.1
Attack vector: physical / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Out-of-bounds write (CWE-787) exists in ZTE ZX297520V3 BootROM.
Check the vendor advisory for the affected versions of ZTE ZX297520V3 BootROM.
Severity: Medium (CVSS 5.1/10). Data can be tampered with by attackers.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで ZTE ZX297520V3 BootROM を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- patch psirt@zte.com.cn