CVE-2026-40003
CVE-2026-40003 is a medium-severity vulnerability in Zte Zx297520v3 Firmware with a CVSS 3.x base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Medium (CVSS 3.x base score 5.1)
- EPSS exploit prediction: 0% (21st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-28232
- Weakness: CWE-787
- Affected product: Zte Zx297520v3 Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-40003?
- 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.
- How severe is CVE-2026-40003?
- CVE-2026-40003 has a CVSS 3.x base score of 5.1, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.
- Is CVE-2026-40003 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-40003?
- CVE-2026-40003 affects Zte Zx297520v3 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-40003?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-40003 have an EU (EUVD) identifier?
- Yes. CVE-2026-40003 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28232.
- When was CVE-2026-40003 published?
- CVE-2026-40003 was published on 2026-05-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:zte:zx297520v3_firmware:-:*:*:*:*:*:*:*
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