What is CVE-2021-43506?

CVE-2021-43506 is a critical-severity vulnerability in Simple Client Management System Project, classified under SQL Injection. CVSS score: 9.8/10. Published 2022-03-31.

How severe is CVE-2021-43506?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-43506 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SQL Injection in Simple Client Management System Project

CVE-2021-43506

An SQL Injection vulnerability exists in Sourcecodester Simple Client Management System 1.0 via the password parameter in Login.php.

Vulnerability class: SQL Injection

Published 2022-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Simple Client Management System Project — versions 1.0

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

raw.githubusercontent.com/Sentinal920/Findings/main/Simple Client Management Sy… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43506?: CVE-2021-43506 is a critical-severity vulnerability in Simple Client Management System Project, classified under SQL Injection. CVSS score: 9.8/10. Published 2022-03-31.
How severe is CVE-2021-43506?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-43506 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.