How severe is CVE-2019-3421?

CVE-2019-3421 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-3421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-3421?

CVE-2019-3421 affects Ztw Zx297520v3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-3421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-3421 published?

CVE-2019-3421 was published on 2019-10-31 and last updated on 2026-06-17.

CVE-2019-3421

CVE-2019-3421 is a high-severity vulnerability in Ztw Zx297520v3 Firmware with a CVSS 3.x base score of 8.0. 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-77.

Key facts

Severity: High (CVSS 3.x base score 8.0)
CVSS v2: 7.7
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Ztw Zx297520v3 Firmware
Published: 2019-10-31
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-3421?: CVE-2019-3421 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-3421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-3421?: CVE-2019-3421 affects Ztw Zx297520v3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-3421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-3421 published?: CVE-2019-3421 was published on 2019-10-31 and last updated on 2026-06-17.

References

http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1011643

Affected products (1)

cpe:2.3:o:ztw:zx297520v3_firmware:*:*:*:*:*:*:*:*

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