CVE-2021-39409: A vulnerability exists in Online Student Rate System v1.0 that allows any user to register as an administrator

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-39409 is a critical-severity flaw (CVSS 9.8) affecting online student rate system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability exists in Online Student Rate System v1.0 that allows any user to register as an administrator without needing to be authenticated.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Published	2022-06-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: online student rate system project

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

Am I affected?

Timeline

2022-06-24 17:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

online student rate system project online student rate system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy online-student-rate-system || rpm -q online-student-rate-system || online-student-rate-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison online-student-rate-system sudo apt install online-student-rate-system=<VERSION_BEFORE_1.0> sudo apt-mark hold online-student-rate-system

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

dnf --showduplicates list online-student-rate-system sudo dnf downgrade online-student-rate-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add online-student-rate-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-2021-39409?

online student rate system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-39409 being exploited?

CVE-2021-39409 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-2021-39409 affect?

CVE-2021-39409 affects online student rate system. Severity is critical (CVSS 9.8). A vulnerability exists in Online Student Rate System v1.0 that allows any user to register as an administrator without needing to be authenticated.

How urgent is CVE-2021-39409?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-39408 MEDIUM 6.1 DOWNGRADE Cross Site Scripting (XSS) vulnerability exists in Online Student Rate System 1.0 via the page parameter on th

References

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