Integer underflow in NetX Duo - CVE-2025-0727
Published: February 21, 2025 / Updated: November 9, 2026
Vulnerability identifier: #VU162949
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-0727
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged remote attacker to cause denial of service by exhausting file system resources.
The vulnerability exists due to an integer underflow in both NetX Duo HTTP server implementations when a PUT request's declared content length is smaller than the data received in a subsequent packet. A low-privileged remote attacker can send this crafted request and continue transmitting data to force an excessively large file to be written.
Affected software
NetX Duo
How to mitigate CVE-2025-0727
Install security update from vendor's website.
NetX Duo - update to 6.4.2