How severe is CVE-2021-43741?

CVE-2021-43741 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43741 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43741?

CVE-2021-43741 affects Cmsimple. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43741?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-43741 published?

CVE-2021-43741 was published on 2022-04-13 and last updated on 2026-06-17.

CVE-2021-43741

CVE-2021-43741 is a critical-severity vulnerability in Cmsimple with a CVSS 3.x base score of 9.8. 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Cmsimple
Published: 2022-04-13
Last modified: 2026-06-17

Description

CMSimple 5.4 is vulnerable to Directory Traversal. The vulnerability exists when a user changes the file name to malicious file on config.php leading to remote code execution.

Frequently asked questions

What is CVE-2021-43741?: CMSimple 5.4 is vulnerable to Directory Traversal. The vulnerability exists when a user changes the file name to malicious file on config.php leading to remote code execution.
How severe is CVE-2021-43741?: CVE-2021-43741 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43741 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43741?: CVE-2021-43741 affects Cmsimple. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43741?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-43741 published?: CVE-2021-43741 was published on 2022-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cmsimple:cmsimple:5.4:*:*:*:*:*:*:*

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