How severe is CVE-2021-43657?

CVE-2021-43657 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-43657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43657?

CVE-2021-43657 affects Simple Client Management System Project Simple Client Management System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43657?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-43657 published?

CVE-2021-43657 was published on 2022-12-22 and last updated on 2026-06-17.

CVE-2021-43657

CVE-2021-43657 is a medium-severity vulnerability in Simple Client Management System Project Simple Client Management System with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Simple Client Management System Project Simple Client Management System
Published: 2022-12-22
Last modified: 2026-06-17

Description

A Stored Cross-site scripting (XSS) vulnerability via MAster.php in Sourcecodetester Simple Client Management System (SCMS) 1.0 allows remote attackers to inject arbitrary web script or HTML via the vulnerable input fields.

Frequently asked questions

What is CVE-2021-43657?: A Stored Cross-site scripting (XSS) vulnerability via MAster.php in Sourcecodetester Simple Client Management System (SCMS) 1.0 allows remote attackers to inject arbitrary web script or HTML via the vulnerable input fields.
How severe is CVE-2021-43657?: CVE-2021-43657 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-43657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43657?: CVE-2021-43657 affects Simple Client Management System Project Simple Client Management System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43657?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43657 published?: CVE-2021-43657 was published on 2022-12-22 and last updated on 2026-06-17.

References

https://github.com/c0n5n3d/CVE-2021-43657/blob/main/Info.txt

Affected products (1)

cpe:2.3:a:simple_client_management_system_project:simple_client_management_system:1.0:*:*:*:*:*:*:*

More vulnerabilities in Simple Client Management System Project Simple Client Management System

CVE-2022-29984 — Critical (CVSS 9.8): Simple Client Management System 1.0 is vulnerable to SQL Injection via /cms/admin/?page=client/view_client&id=.
CVE-2022-29983 — Critical (CVSS 9.8): Simple Client Management System 1.0 is vulnerable to SQL Injection via /cms/admin/?page=invoice/view_invoice&id=.
CVE-2022-29982 — Critical (CVSS 9.8): Simple Client Management System 1.0 is vulnerable to SQL Injection via /cms/admin/maintenance/manage_service.php?id=.
CVE-2022-29981 — Critical (CVSS 9.8): Simple Client Management System 1.0 is vulnerable to SQL Injection via /cms/classes/Users.php?f=delete.
CVE-2022-29980 — Critical (CVSS 9.8): Simple Client Management System 1.0 is vulnerable to SQL Injection via /cms/admin/?page=user/manage_user&id=.
CVE-2022-29979 — Critical (CVSS 9.8): Simple Client Management System 1.0 is vulnerable to SQL Injection via /cms/classes/Master.php?f=delete_designation.

All CVEs affecting Simple Client Management System Project Simple Client Management System →

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