CVE-2021-42667: A SQL Injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP in e

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-42667 is a critical-severity flaw (CVSS 9.8) affecting online event booking and reservation system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A SQL Injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP in event-management/views. An attacker can leverage this vulnerability in order to manipulate the sql query performed. As a result he can extract sensitive data from the web server and in some cases he can use this vulnerability in order to get a remote code execution on the remote web server.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
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	16.2% (top 3%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-11-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: online event booking and reservation system project

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

Am I affected?

Timeline

2021-11-05 13:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

online event booking and reservation system project online event booking and reservation system DOWNGRADE

Affected: 2.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.0

1. Check installed version

apt-cache policy online-event-booking-and-reservation-system || rpm -q online-event-booking-and-reservation-system || online-event-booking-and-reservation-system --version

2. No fixed release: DOWNGRADE to a release before 2.3.0 (Debian / Ubuntu)

apt-cache madison online-event-booking-and-reservation-system sudo apt install online-event-booking-and-reservation-system=<VERSION_BEFORE_2.3.0> sudo apt-mark hold online-event-booking-and-reservation-system

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

dnf --showduplicates list online-event-booking-and-reservation-system sudo dnf downgrade online-event-booking-and-reservation-system-<VERSION_BEFORE_2.3.0> sudo dnf versionlock add online-event-booking-and-reservation-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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Online Event Booking and Reservation System 2.3.0 - SQL Injection

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-2021-42667?

online event booking and reservation system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-42667 being exploited?

CVE-2021-42667 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-2021-42667 affect?

CVE-2021-42667 affects online event booking and reservation system. Severity is critical (CVSS 9.8). A SQL Injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP in event-management/views. An attacker can leverage this vulnerability in order to manipulate the sql query performed. As a result he

How urgent is CVE-2021-42667?

Priority 69/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-42663 MEDIUM 4.3 DOWNGRADE An HTML injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/My
CVE-2021-42662 MEDIUM 5.4 DOWNGRADE A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Event Booking and Reservatio

References

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