How severe is CVE-2025-66449?

CVE-2025-66449 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66449 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66449?

CVE-2025-66449 affects C4illin Convertx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66449?

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

Does CVE-2025-66449 have an EU (EUVD) identifier?

Yes. CVE-2025-66449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203483.

When was CVE-2025-66449 published?

CVE-2025-66449 was published on 2025-12-16 and last updated on 2026-06-17.

CVE-2025-66449

CVE-2025-66449 is a high-severity vulnerability in C4illin Convertx with a CVSS 3.x base score of 8.8. 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: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203483
Weakness: CWE-22
Affected product: C4illin Convertx
Published: 2025-12-16
Last modified: 2026-06-17

Description

ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint `/upload` allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes `file.name` directly from user supplied data without doing any sanitization on the name thus allowing for arbitrary file write. This can be used to overwrite system binaries with ones provided from an attacker allowing full code execution. Version 0.16.0 contains a patch for the issue.

Frequently asked questions

What is CVE-2025-66449?: ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint `/upload` allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes `file.name` directly from user supplied data without doing any sanitization on the name thus allowing for arbitrary file write. This can be used to overwrite system binaries with ones provided from an attacker allowing full code execution. Version 0.16.0 contains a patch for the issue.
How severe is CVE-2025-66449?: CVE-2025-66449 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66449 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66449?: CVE-2025-66449 affects C4illin Convertx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66449?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66449 have an EU (EUVD) identifier?: Yes. CVE-2025-66449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203483.
When was CVE-2025-66449 published?: CVE-2025-66449 was published on 2025-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:c4illin:convertx:*:*:*:*:*:*:*:*

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