CVE-2021-42332Network attack vector

Authenticated message disclosure via unchecked URL parameters

Published Oct 15, 2021 · Updated Sep 17, 2024

Improper authorization in ShinHer StudyOnline System 2021 allows remote authenticated users to read other users' message boards. The List_View message-board function accepts a user-controlled URL parameter without verifying that the requested board belongs to the logged-in account. A standard user account is required, and exploitation exposes message-board content without reported write or service-impact capabilities.

CVSS severity4.3
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper authorization in ShinHer StudyOnline System 2021 allows remote authenticated users to read other users' message boards. The List_View message-board function accepts a user-controlled URL parameter without verifying that the requested board belongs to the logged-in account. A standard user account is required, and exploitation exposes message-board content without reported write or service-impact capabilities.

The record

CVE
CVE-2021-42332
Published
Oct 15, 2021
Updated
Sep 17, 2024
Vendor
ShinHer Information Co., LTD.
Product
ShinHer StudyOnline System
Classifications
CWE-285, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <=2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ShinHer Information Co., LTD. · ShinHer StudyOnline Systemversion=unspecified <=2021

Published CVSS scores

4.3TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo