CVE-2021-42331: The “Study Edit” function of ShinHer StudyOnline System does not perform permission control

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-42331 is a medium-severity flaw (CVSS 5.4) affecting xinhe teaching platform system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The “Study Edit” function of ShinHer StudyOnline System does not perform permission control. After logging in with user’s privilege, remote attackers can access and edit other users’ tutorial schedule by crafting URL parameters.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-285, CWE-862
Published	2021-10-15
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: xinheinformation

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-15 12:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

xinheinformation xinhe teaching platform system DOWNGRADE

Affected: v2021

Fixed in: no fixed release known

Safe to downgrade to: a release before v2021

1. Check installed version

apt-cache policy xinhe-teaching-platform-system || rpm -q xinhe-teaching-platform-system || xinhe-teaching-platform-system --version

2. No fixed release: DOWNGRADE to a release before v2021 (Debian / Ubuntu)

apt-cache madison xinhe-teaching-platform-system sudo apt install xinhe-teaching-platform-system=<VERSION_BEFORE_v2021> sudo apt-mark hold xinhe-teaching-platform-system

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xinhe-teaching-platform-system sudo dnf downgrade xinhe-teaching-platform-system-<VERSION_BEFORE_v2021> sudo dnf versionlock add xinhe-teaching-platform-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-42331?

xinhe teaching platform system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-42331 being exploited?

CVE-2021-42331 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-42331 affect?

CVE-2021-42331 affects xinhe teaching platform system. Severity is medium (CVSS 5.4). The “Study Edit” function of ShinHer StudyOnline System does not perform permission control. After logging in with user’s privilege, remote attackers can access and edit other users’ tutorial schedule by crafting URL parameters.

How urgent is CVE-2021-42331?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2021-42332 MEDIUM 4.3 DOWNGRADE The “List View” function of ShinHer StudyOnline System is not under authority control
CVE-2021-42330 HIGH 8.8 DOWNGRADE The “Teacher Edit” function of ShinHer StudyOnline System does not perform authority control
CVE-2021-42329 MEDIUM 5.4 DOWNGRADE The “List_Add” function of message board of ShinHer StudyOnline System does not filter special characters in t

References

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