What is CVE-2019-3421?

CVE-2019-3421 is a high-severity vulnerability in ZTE Corporation Zx297520v3, classified under Command Injection. CVSS score: 8.0/10. Published 2019-10-31.

How severe is CVE-2019-3421?

High severity. CVSS v3 base score is 8.0 out of 10.

RCE in ZTE Corporation Zx297520v3

CVE-2019-3421

The 7520V3V1.0.0B09P27 version, and all earlier versions of ZTE product ZX297520V3 are impacted by a Command Injection vulnerability. Unauthorized users can exploit this vulnerability to control the user terminal system.

Vulnerability class: Command Injection (OS Command Injection)

Published 2019-10-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.4th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

ZTE Corporation Zx297520v3 — versions All versions up to 7520V3V1.0.0B09P27
Ztw Zx297520v3
Ztw Zx297520v3 Firmware

Weakness classification (CWE)

CWE-77 — Command Injection

References

support.zte.com.cn/support/news/LoopholeInfoDetail.aspx (Vendor Advisory)

Frequently asked questions

What is CVE-2019-3421?: CVE-2019-3421 is a high-severity vulnerability in ZTE Corporation Zx297520v3, classified under Command Injection. CVSS score: 8.0/10. Published 2019-10-31.
How severe is CVE-2019-3421?: High severity. CVSS v3 base score is 8.0 out of 10.