CVE-2021-42335Network attack vector

Stored XSS via unfiltered object-name parameter

Published Oct 15, 2021 · Updated Sep 16, 2024

Stored XSS in Huachu Digital Technology EasyTest 1705 allows remote authenticated users to execute JavaScript through bulletin-board entries. The bulletin-board management function stores an object-name parameter without filtering special characters, causing later page views to treat injected script as executable content. Ordinary user privileges are required to plant the payload, and exploitation requires another user to view the affected content; reported impact is limited to confidentiality and integrity.

CVSS severity5.4
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Huachu Digital Technology EasyTest 1705 allows remote authenticated users to execute JavaScript through bulletin-board entries. The bulletin-board management function stores an object-name parameter without filtering special characters, causing later page views to treat injected script as executable content. Ordinary user privileges are required to plant the payload, and exploitation requires another user to view the affected content; reported impact is limited to confidentiality and integrity.

The record

CVE
CVE-2021-42335
Published
Oct 15, 2021
Updated
Sep 16, 2024
Vendor
Huachu Digital Technology Limited Company
Product
EasyTest Online Learning Test Platform
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=1705

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Huachu Digital Technology Limited Company · EasyTest Online Learning Test Platformversion=1705

Published CVSS scores

5.4TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

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.

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No observations available

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

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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