CVE-2021-43130: An SQL Injection vulnerability exists in Sourcecodester Customer Relationship Management System (CRM) 1.0 via

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-43130 is a critical-severity flaw (CVSS 9.8) affecting customer relationship management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An SQL Injection vulnerability exists in Sourcecodester Customer Relationship Management System (CRM) 1.0 via the username parameter in customer/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	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-11-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: customer relationship management system project

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

Am I affected?

Timeline

2021-11-03 15:15 UTCPublished CVE record published
2026-06-17 04:10 UTCUpdated Record last modified

customer relationship management system project customer relationship management 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 customer-relationship-management-system || rpm -q customer-relationship-management-system || customer-relationship-management-system --version

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

apt-cache madison customer-relationship-management-system sudo apt install customer-relationship-management-system=<VERSION_BEFORE_1.0> sudo apt-mark hold customer-relationship-management-system

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

dnf --showduplicates list customer-relationship-management-system sudo dnf downgrade customer-relationship-management-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add customer-relationship-management-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-2021-43130?

customer relationship management system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43130 being exploited?

CVE-2021-43130 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-2021-43130 affect?

CVE-2021-43130 affects customer relationship management system. Severity is critical (CVSS 9.8). An SQL Injection vulnerability exists in Sourcecodester Customer Relationship Management System (CRM) 1.0 via the username parameter in customer/login.php.

How urgent is CVE-2021-43130?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-37221 HIGH 8.8 DOWNGRADE A file upload vulnerability exists in Sourcecodester Customer Relationship Management System 1.0 via the accou

References

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