CVE-2021-21751

Service interruption via inconsistent URL validation

Published Dec 27, 2021 · Updated Aug 3, 2024

Input validation in ZTE ZXIN10 CMS allows remote authenticated users with high privileges to interrupt service via a crafted URL. The large-screen page's front end accepts a URL that the back end handles differently, allowing the configuration to trigger a service exception. Exploitation requires high-privilege access, adjacency to the target network, and user interaction; no confidentiality impact is reported.

CVSS severity6.5
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input validation in ZTE ZXIN10 CMS allows remote authenticated users with high privileges to interrupt service via a crafted URL. The large-screen page's front end accepts a URL that the back end handles differently, allowing the configuration to trigger a service exception. Exploitation requires high-privilege access, adjacency to the target network, and user interaction; no confidentiality impact is reported.

The record

CVE
CVE-2021-21751
Published
Dec 27, 2021
Updated
Aug 3, 2024
Vendor
ZTE Corporation
Product
ZXIN10 CMS
Classifications
T1499.004
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Dec 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions up to ZXOMS-BIGDATA-IOPSWEBV3.01.01.04

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

ZTE Corporation · ZXIN10 CMSversion=All versions up to ZXOMS-BIGDATA-IOPSWEBV3.01.01.04

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
6.5ZTE CorporationCVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:H
5.5NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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