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Vulnerabilities

Security fix · CVE-2025-66449

ConvertXis a self-hosted online file converter.

Published Dec 16, 2025 · catalog updated Dec 16, 2025 · C4illin ConvertX

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-66449. EPSS is 0.78%. Act only if a listed version of C4illin ConvertX is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.78%
Remediation
Version ranges on file
Affected products
vendor C4illin ConvertX < 0.16.0

ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor C4illin ConvertX < 0.16.0< 0.16.0

How to fix CVE-2025-66449

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-66449. EPSS is 0.78%. Act only if a listed version of C4illin ConvertX is installed.

Which versions are affected?

Compare what you have installed with C4illin ConvertX < 0.16.0 < 0.16.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.78%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 16, 2025 · EUVD

    Detected

    ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes 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 wit

  2. Dec 16, 2025 · EUVD

    Updated

    ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes 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 wit

Sources

  • CVE.orgVulnerability recordCVE-2025-66449

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66449

    30-day exploitation probability 0.78%

    first.org
  • EUVDVulnerability recordEUVD-2025-203483

    ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes directly from user supplied data without doin

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgNov 2, 2026
  • EUVDNov 1, 2026