CVE-2021-43498: An Access Control vulnerability exists in ATutor 2.2.4 in password_reminder.php when the g, id, h, form_passwo

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-43498 is a high-severity flaw (CVSS 7.5) affecting atutor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Access Control vulnerability exists in ATutor 2.2.4 in password_reminder.php when the g, id, h, form_password_hidden, and form_change HTTP POST parameters are set.

Why this priority

High 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-640
Published	2022-04-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: atutor

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

Am I affected?

Timeline

2022-04-08 19:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

atutor atutor DOWNGRADE

Affected: 2.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.4

1. Check installed version

apt-cache policy atutor || rpm -q atutor || atutor --version

2. No fixed release: DOWNGRADE to a release before 2.2.4 (Debian / Ubuntu)

apt-cache madison atutor sudo apt install atutor=<VERSION_BEFORE_2.2.4> sudo apt-mark hold atutor

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

dnf --showduplicates list atutor sudo dnf downgrade atutor-<VERSION_BEFORE_2.2.4> sudo dnf versionlock add atutor

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-2021-43498?

atutor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43498 being exploited?

CVE-2021-43498 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-2021-43498 affect?

CVE-2021-43498 affects atutor. Severity is high (CVSS 7.5). An Access Control vulnerability exists in ATutor 2.2.4 in password_reminder.php when the g, id, h, form_password_hidden, and form_change HTTP POST parameters are set.

How urgent is CVE-2021-43498?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-27008 MEDIUM 6.1 DOWNGRADE A Cross-site scripting (XSS) vulnerability in the function encrypt_password() in login.tmpl.php in ATutor 2.2.
CVE-2020-23341 MEDIUM 6.1 UPGRADE A reflected cross site scripting (XSS) vulnerability in the /header.tmpl.php component of ATutor 2.2.4 allows
CVE-2019-7172 MEDIUM 6.1 UPGRADE A stored-self XSS exists in ATutor through v2.2.4, allowing an attacker to execute HTML or JavaScript code in
CVE-2019-12170 HIGH 8.8 UPGRADE ATutor through 2.2.4 is vulnerable to arbitrary file uploads via the mods/_core/backups/upload.php (aka backup
CVE-2019-12169 HIGH 8.8 UPGRADE ATutor 2.2.4 allows Arbitrary File Upload and Directory Traversal, resulting in remote code execution via a ".

References

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