CVE-2021-21726

What it is

Some ZTE products have an input verification vulnerability in the diagnostic function interface. Due to insufficient verification of some parameters input by users, an attacker with high privileges can cause process exception by repeatedly inputting illegal parameters. This affects:<ZXONE 9700 , ZXONE 8700, ZXONE 19700><V1.40.021.021CP049, V1.0P02B219_@NCPM-RELEASE_2.40R1-20200914.set>

At a glance

Exploitability

Can be exploited locally on the machine with an admin-level account. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-03-12 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:36 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.4% in the next 30 days (EPSS).
• Severity: 2.3 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-03-12 19:15 UTC

Last modified

2026-06-17 03:36 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Zte Zxone 9700 Firmware 1.40.021.021cp049
• Zte Zxone 8700 Firmware 1.40.021.021cp049
• Zte Zxone 19700 Firmware 1.0p02b219_\@ncpm-release_2.40r1-20200914.set

Attack profile CVSS 3.1 · 2.3

Attack vector

Local

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-21726.md and follow it. Check whether this project is affected by CVE-2021-21726. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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