CVE-2019-3421: The 7520V3V1.0.0B09P27 version, and all earlier versions of ZTE product ZX297520V3 are impacted by a Command I

Q: How do I fix CVE-2019-3421?

zx297520v3 firmware: upgrade to newer than 7520v3v1.0.0b09p27. Exact commands for each OS are on this page.

Q: Is CVE-2019-3421 being exploited?

CVE-2019-3421 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-3421 affect?

CVE-2019-3421 affects zx297520v3 firmware. Severity is high (CVSS 8.0). 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.

This month

HIGH 8.0UPGRADE

CVE-2019-3421 is a high-severity flaw (CVSS 8.0) affecting zx297520v3 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Weakness	CWE-77
Published	2019-10-31
Last modified	2026-06-17

Publisher (CNA): ZTE Corporation · Vendor: ztw

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-10-31 16:15 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

ztw zx297520v3 firmware UPGRADE

Affected: <= 7520v3v1.0.0b09p27

Fixed in: newer than 7520v3v1.0.0b09p27

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-3421?

zx297520v3 firmware: upgrade to newer than 7520v3v1.0.0b09p27. Exact commands for each OS are on this page.

Is CVE-2019-3421 being exploited?

CVE-2019-3421 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-3421 affect?

CVE-2019-3421 affects zx297520v3 firmware. Severity is high (CVSS 8.0). 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.

How urgent is CVE-2019-3421?

Priority 45/100. High severity

Software pages

ZTE vulnerabilities

Related CVEs

CVE-2026-40003 MEDIUM 5.1 MITIGATE ZTE ZX297520V3 BootROM contains a vulnerability that allows arbitrary memory writes via USB

References

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