CVE-2021-41660: SQL injection vulnerability in Sourcecodester Patient Appointment Scheduler System v1 by oretnom23, allows att

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-41660 is a critical-severity flaw (CVSS 9.8) affecting patient appointment scheduler system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL injection vulnerability in Sourcecodester Patient Appointment Scheduler System v1 by oretnom23, allows attackers to execute arbitrary SQL commands via the username and password fields to login.php.

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	1.3% (top 31%)
CISA exploited list	No
Weakness	CWE-89
Published	2022-01-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: patient appointment scheduler system project

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

Am I affected?

Timeline

2022-01-24 18:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

patient appointment scheduler system project patient appointment scheduler 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 patient-appointment-scheduler-system || rpm -q patient-appointment-scheduler-system || patient-appointment-scheduler-system --version

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

apt-cache madison patient-appointment-scheduler-system sudo apt install patient-appointment-scheduler-system=<VERSION_BEFORE_1.0> sudo apt-mark hold patient-appointment-scheduler-system

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

dnf --showduplicates list patient-appointment-scheduler-system sudo dnf downgrade patient-appointment-scheduler-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add patient-appointment-scheduler-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-2021-41660?

patient appointment scheduler system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-41660 being exploited?

CVE-2021-41660 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-2021-41660 affect?

CVE-2021-41660 affects patient appointment scheduler system. Severity is critical (CVSS 9.8). SQL injection vulnerability in Sourcecodester Patient Appointment Scheduler System v1 by oretnom23, allows attackers to execute arbitrary SQL commands via the username and password fields to login.php.

How urgent is CVE-2021-41660?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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