CVE•Published 2025-12-16•Modified 2026-10-07•1 article on news•6 live references•NVD data

CVE-2025-66449C4illin · Convertx

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 45% of all CVEs

Weaknesses (CWE)

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')CWE-73External Control of File Name or Path CWE-434Unrestricted Upload of File with Dangerous Type

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.

Timeline

Published 2025-12-16

Modified 2026-10-07

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2025-66449

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"C4illin Convertx"

All exposed C4illin Convertx instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Convertx"

HTTP body or banner mentions "Convertx" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2025-66449